Weakness (CWE)
CWE-20: Improper Input Validation
The product receives input or data, but it does
not validate or incorrectly validates that the input has the
properties that are required to process the data safely and
correctly.
How to prevent it (8 mitigations)
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Architecture and Design
Consider using language-theoretic security (LangSec) techniques that characterize inputs using a formal language and build "recognizers" for that language. This effectively requires parsing to be a distinct layer that effectively enforces a boundary between raw input and internal data representations, instead of allowing parser code to be scattered throughout the program, where it could be subject to errors or inconsistencies that create weaknesses. [REF-1109] [REF-1110] [REF-1111]
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Architecture and Design
Use an input validation framework such as Struts or the OWASP ESAPI Validation API. Note that using a framework does not automatically address all input validation problems; be mindful of weaknesses that could arise from misusing the framework itself (CWE-1173).
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Architecture and Design, Implementation
Understand all the potential areas where untrusted inputs can enter the product, including but not limited to: parameters or arguments, cookies, anything read from the network, environment variables, reverse DNS lookups, query results, request headers, URL components, e-mail, files, filenames, databases, and any external systems that provide data to the application. Remember that such inputs may be obtained indirectly through API calls.
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Implementation
Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
When performing input validation, consider all potentially relevant properties, including length, type of input, the full range of acceptable values, missing or extra inputs, syntax, consistency across related fields, and conformance to business rules. As an example of business rule logic, "boat" may be syntactically valid because it only contains alphanumeric characters, but it is not valid if the input is only expected to contain colors such as "red" or "blue."
Do not rely exclusively on looking for malicious or malformed inputs. This is likely to miss at least one undesirable input, especially if the code's environment changes. This can give attackers enough room to bypass the intended validation. However, denylists can be useful for detecting potential attacks or determining which inputs are so malformed that they should be rejected outright.
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Architecture and Design
For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks entirely. Then, these modified values would be submitted to the server.
Even though client-side checks provide minimal benefits with respect to server-side security, they are still useful. First, they can support intrusion detection. If the server receives input that should have been rejected by the client, then it may be an indication of an attack. Second, client-side error-checking can provide helpful feedback to the user about the expectations for valid input. Third, there may be a reduction in server-side processing time for accidental input errors, although this is typically a small savings.
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Implementation
When your application combines data from multiple sources, perform the validation after the sources have been combined. The individual data elements may pass the validation step but violate the intended restrictions after they have been combined.
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Implementation
Be especially careful to validate all input when invoking code that crosses language boundaries, such as from an interpreted language to native code. This could create an unexpected interaction between the language boundaries. Ensure that you are not violating any of the expectations of the language with which you are interfacing. For example, even though Java may not be susceptible to buffer overflows, providing a large argument in a call to native code might trigger an overflow.
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Implementation
Directly convert your input type into the expected data type, such as using a conversion function that translates a string into a number. After converting to the expected data type, ensure that the input's values fall within the expected range of allowable values and that multi-field consistencies are maintained.
Source: MITRE CWE-20
116 results · Clear filters · Feed
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Critical 10.0CVE-2026-115905 Public exploit
zip: Critical Parser Differential & Security Control Bypass via Dual-Header Inconsistencies (Zip Cloaking) Leading to Arbitrary File Overwrite & RCE
zip is a zip library for Rust that supports reading and writing simple ZIP files. Through 9.0.4, ZipArchive treats Central Directory File Header filenames as authoritative while ZipStreamReader extracts using Local File Header filenames without reconciling th…
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Critical 9.3CVE-2026-99999 Public exploit
ipv4: validate checksum_start before completing checksum
In the Linux kernel, the following vulnerability has been resolved: ipv4: validate checksum_start before completing checksum If a packet with bad checksum metadata gets into the ipv4 stack, skb_checksum_help can corrupt the network header and cause a bunch of…
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Critical 9.8CVE-2026-96760 Public exploit
Authlib library contains a signature‑verification bypass vulnerability
Authlib (v1.8.0 and below) contains a signature verification bypass vulnerability. The JsonWebSignature.deserialize_json() method accepts a JSON Serialization JWS object and returns the payload as successfully verified without checking for a signature and wit…
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Critical 9.5
A remote code execution vulnerability exists due to improper input validation, which can allow an unauthenticated attacker to execute arbitrary commands
Improper input validation vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. This issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, and before 13.1.37.279 FIPS and NDcPP; Gateway: before 14.1-73.37 and before 13…
KEV Sep 27, 2026 -
Critical 9.6CVE-2026-100833 Public exploit
Contrast before 1.23.1 Image Substitution via Policy Generation
Contrast (edgelesssys/contrast) versions 1.14.0 before 1.23.1 generate runtime policies that fail to detect all container image substitutions. A bad rebase during a Kata Containers update accidentally introduced an `allow_storage` rule that accepts storage en…
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Critical 9.1CVE-2026-77542 Public exploit
A malicious actor with access to the network and high privileges could exploit an Improper Input Validation vulnerabili…
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Critical 9.8CVE-2026-19912 Public exploit
CVE-2026-19912
The Kaltura HTML5 player (mwEmbed / html5lib) contains an unauthenticated remote code execution vulnerability caused by unsafe data deserialization and unsanitized filesystem path construction. mwEmbedLoader.php accepts a user‑controlled ServiceUrl, whose res…
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Critical 9.8CVE-2026-78329 Public exploit
Apache Camel: Camel-Undertow: the endpoint discarded the undertow-specific header filter strategy in favour of the base HTTP one, so the undertow filtering never ran on endpoint-configured routes
Improper input validation vulnerability in Apache Camel Undertow component. This issue affects Apache Camel: from 4.11.0 before 4.14.9, from 4.15.0 before 4.18.4, from 4.19.0 before 4.22.0. UndertowEndpoint defaulted its headerFilterStrategy field to the base…
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Critical 9.8CVE-2026-71300 Public exploit
Apache Camel: Camel-Atmosphere-Websocket: WebSocket dispatch header injection
Improper input validation vulnerability in Apache Camel Atmosphere Websocket component. This issue affects Apache Camel: from 4.0.0 before 4.14.9, from 4.15.0 before 4.18.4, from 4.19.0 before 4.22.0. The camel-atmosphere-websocket producer selects which conn…
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Critical 9.9CVE-2026-72867 Public exploit
Dokploy: Incomplete fix of CVE-2026-45628: Command Injection via Unvalidated Branch Fields in Compose Deployment Pipeline (server-side regex missing in compose.ts)
Dokploy is a free, self-hostable Platform as a Service (PaaS). From 0.29.3 until 0.29.13, the incomplete fix for CVE-2026-45628 leaves packages/server/src/db/schema/compose.ts branch fields without server-side validation, allowing a direct compose.update requ…
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Critical 9.9CVE-2026-20303 Public exploit
Cisco Catalyst SD-WAN Security Hardening Release - Input Validation Vulnerabilities
As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Catalyst SD-WAN engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple inter…
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Critical 10.0CVE-2026-33267 Public exploit
Apache Traffic Server: Untrusted @ headers can spoof ATS internal metadata
Improper Input Validation vulnerability in Apache Traffic Server. This issue affects Apache Traffic Server: from 9.2.0 through 9.2.14, from 10.1.0 through 10.1.3. Users are recommended to upgrade to version 9.2.15 or 10.1.4, which fixes the issue.
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Critical 10.0CVE-2026-47668 Public exploit
DbGate: Unauthenticated Remote Code Execution via JSON Script Runner
DbGate is cross-platform database manager. In versions 7.1.8 and prior, DbGate's JSON script runner (`POST /runners/start`) allows remote code execution via code injection in the `functionName` parameter of JSON script `assign` commands. The `functionName` va…
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Critical 9.0CVE-2026-16723 Public exploit
Remote Code Execution in fastjson 1.2.68–1.2.83
A remote code execution (RCE) vulnerability exists in fastjson 1.2.68 through 1.2.83. This vulnerability is exploitable under fastjson's stock default configuration — no AutoType enablement required, no classpath gadget required.
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Critical 9.8CVE-2026-13001 Public exploit
Podlove Podcast Publisher <= 4.5.1 - Unauthenticated Arbitrary File Upload via podlove_image_cache_url Parameter
The Podlove Podcast Publisher plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the 'podlove_handle_cache_files' function in all versions up to, and including, 4.5.1. This makes it possible for unauthenticated…
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Critical 9.1CVE-2026-41042 Public exploit
Apache Gravitino: Unauthenticated callers can supply a malicious H2 JDBC URL through the testConnection API, which executes arbitrary Java code on the server via H2's INIT parameter
Unauthenticated callers can supply a malicious H2 JDBC URL through the testConnection API, which executes arbitrary Java code on the server via H2's INIT parameter. Vulnerability in Apache Gravitino. This issue affects Apache Gravitino: before 1.2.1. Users ar…
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Critical 9.1CVE-2026-48205 Public exploit
Apache Camel DNS: The dns.* and term Exchange header constants used non-Camel-prefixed names that bypass the HTTP header filter, allowing an HTTP client to influence internal behaviour
Improper Input Validation, Server-Side Request Forgery (SSRF) vulnerability in Apache Camel DNS component. The camel-dns producers read DNS operation parameters - the resolver to query, the name or domain to look up, the record type and class, and the search …
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Critical 9.8CVE-2026-48204 Public exploit
Apache Camel: Camel-MongoDB-GridFS: The gridfs.* control headers used non-Camel-prefixed names that bypass the HTTP header filter, allowing an HTTP client to switch the GridFS operation - including destructive file deletion - in the default configuration
Improper Input Validation, Improper Access Control vulnerability in Apache Camel in Camel Mongodb Gridfs component. The camel-mongodb-gridfs producer selects the GridFS operation to perform from the gridfs.operation Exchange header when the endpoint's operati…
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Critical 9.1CVE-2026-48203 Public exploit
Apache Camel: Camel-Solr: The SolrParam. and SolrField. Exchange header prefixes used non-Camel-prefixed names that bypass the HTTP header filter, allowing an HTTP client to inject Solr query parameters (server-side request forgery) and document fields
Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection'), Improper Input Validation, Server-Side Request Forgery (SSRF) vulnerability in Apache Camel Solr component. The camel-solr producer copies Exchange message hea…
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Critical 9.8CVE-2026-46456 Public exploit
Apache Camel: Camel-AWS2-SQS: Inbound message attributes are mapped into the Exchange without an inbound HeaderFilterStrategy, allowing a message sender to inject Camel control headers
Improper Input Validation vulnerability in Apache Camel AWS2-SQS Component. The camel-aws2-sqs component map inbound message attributes into the Camel Exchange through a component-specific HeaderFilterStrategy. Sqs2HeaderFilterStrategy configured only an outb…
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Critical 9.8CVE-2026-46454 Public exploit
Apache Camel: Camel-Cometd: Inbound Bayeux message headers are mapped into the Exchange without a HeaderFilterStrategy, allowing unauthenticated clients to inject Camel control headers
Improper Input Validation vulnerability in Apache Camel Cometd Component. The camel-cometd component maps inbound Bayeux (CometD) message headers into the Camel Exchange without applying a HeaderFilterStrategy. CometdBinding.populateExchangeFromMessage copies…
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Critical 9.6CVE-2026-14382 Public exploit
Insufficient validation of untrusted input in ANGLE in Google Chrome prior to 150.0.7871.46 allowed a remote attacker t…
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Critical 9.6CVE-2026-13934 Public exploit
Insufficient validation of untrusted input in Dawn in Google Chrome on Android prior to 150.0.7871.47 allowed a remote …
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Critical 9.6CVE-2026-11120 Public exploit
Insufficient validation of untrusted input in Enterprise Reporting in Google Chrome prior to 149.0.7827.53 allowed a re…
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Critical 9.6CVE-2026-11119 Public exploit
Inappropriate implementation in GPU in Google Chrome on Android prior to 149.0.7827.53 allowed a remote attacker who ha…
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Critical 9.6CVE-2026-11113 Public exploit
Insufficient validation of untrusted input in ANGLE in Google Chrome prior to 149.0.7827.53 allowed a remote attacker w…
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Critical 9.6CVE-2026-11112 Public exploit
Insufficient validation of untrusted input in Chromoting in Google Chrome on Linux prior to 149.0.7827.53 allowed a rem…
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Critical 9.1CVE-2026-48188 Public exploit
SQL Injection via MySQL Quote Method
An improper Input Validation vulnerability in OTRS or ((OTRS)) Community Edition database layer module allows an unauthenticated SQL injection which can lead to an authentication bypass. This issue only affects the system if the MySQL/MariaDB server is config…
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Critical 10.0
A malicious actor with access to the network could exploit an Improper Input Validation vulnerability found in UniFi OS…
KEV Jun 23, 2026 -
Critical 9.8CVE-2026-41293 Public exploit
Apache Tomcat: HTTP/2 request headers not validated
Improper Input Validation vulnerability in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.21, from 10.1.0-M1 through 10.1.54, from 9.0.0.M1 through 9.0.117, from 10.0.0-M1 through 10.0.27. Older, end of support versions may also …
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Critical 9.4CVE-2026-42613 Public exploit
Grav: Privilege Escalation via Missing Server-Side Validation of groups/access
Grav is a file-based Web platform. Prior to 2.0.0-beta.2, the Login::register() method in the Login plugin accepts attacker-controlled groups and access fields from the registration POST data without server-side validation. When registration is enabled and gr…
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Critical 10.0CVE-2026-32604 Public exploit
Spinnaker vulnerable to RCE when using gitrepo artifact types due to improper sanitization of user input on branch and paths
Spinnaker is an open source, multi-cloud continuous delivery platform. In versions prior to 2026.1.0, 2026.0.1, 2025.4.2, and 2025.3.2, a bad actor can execute arbitrary commands very simply on the clouddriver pods. This can expose credentials, remove files, …
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Critical 10.0CVE-2026-35031 Public exploit
Jellyfin: Potential RCE via subtitle upload path traversal + .strm chain
Jellyfin is an open source self hosted media server. Versions prior to 10.11.7 contain a vulnerability chain in the subtitle upload endpoint (POST /Videos/{itemId}/Subtitles), where the Format field is not validated, allowing path traversal via the file exten…
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Critical 9.8CVE-2026-34243 Public exploit
wenxian: Command Injection in GitHub Actions Workflow via `issue_comment.body`
wenxian is a tool to generate BIBTEX files from given identifiers (DOI, PMID, arXiv ID, or paper title). In versions 0.3.1 and prior, a GitHub Actions workflow uses untrusted user input from issue_comment.body directly inside a shell command, allowing potenti…
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Critical 9.1CVE-2026-23489 Public exploit
Fields GLPI plugin vulnerable to RCE in dropdown generation
Fields is a GLPI plugin that allows users to add custom fields on GLPI items forms. Prior to version 1.23.3, it is possible to execute arbitrary PHP code from users that are allowed to create dropdowns. This issue has been patched in version 1.23.3.
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Critical 9.9CVE-2026-28466 Public exploit
OpenClaw < 2026.2.14 - Remote Code Execution via Node Invoke Approval Bypass
OpenClaw versions prior to 2026.2.14 contain a vulnerability in the gateway in which it fails to sanitize internal approval fields in node.invoke parameters, allowing authenticated clients to bypass exec approval gating for system.run commands. Attackers with…
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Critical 10.0CVE-2026-0848 Public exploit
Arbitrary Code Execution in NLTK StanfordSegmenter via Untrusted JAR Loading
NLTK versions <=3.9.2 are vulnerable to arbitrary code execution due to improper input validation in the StanfordSegmenter module. The module dynamically loads external Java .jar files without verification or sandboxing. An attacker can supply or replace the …
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Critical 10.0
n8n Vulnerable to Unauthenticated File Access via Improper Webhook Request Handling
n8n is an open source workflow automation platform. Versions starting with 1.65.0 and below 1.121.0 enable an attacker to access files on the underlying server through execution of certain form-based workflows. A vulnerable workflow could grant access to an u…
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Critical 10.0
Cisco Secure Email Gateway and Cisco Secure Email and Web Manager Remote Command Execution Vulnerability
A vulnerability in the Spam Quarantine feature of Cisco AsyncOS Software for Cisco Secure Email Gateway and Cisco Secure Email and Web Manager could allow an unauthenticated, remote attacker to execute arbitrary system commands on an affected device with root…
KEV Dec 17, 2025 -
Critical 9.8CVE-2025-14156 Public exploit
Fox LMS – WordPress LMS Plugin 1.0.4.7 - 1.0.5.1 - Unauthenticated Privilege Escalation via 'createOrder'
The Fox LMS – WordPress LMS Plugin plugin for WordPress is vulnerable to privilege escalation in all versions up to, and including, 1.0.5.1. This is due to the plugin not properly validating the 'role' parameter when creating new users via the `/fox-lms/v1/pa…