Weakness (CWE)
CWE-918: Server-Side Request Forgery
The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.
How to prevent it (3 mitigations)
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Implementation, Operation
If there is a known list of applications, IP, hostname, and/or domains to which the product is allowed to communicate, then use allowlists to ensure that outgoing requests are restricted to these known entities. The allowlists could be in the application code or possibly enforced by firewalls or network segmentation [REF-1511].
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Implementation, Operation
If the product is expected to be able to connect to arbitrary IP addresses or domains, consider using a denylist that includes private network addresses, internal domain names, etc. The denylist could be in the application code or possibly enforced by firewalls or network segmentation [REF-1511].
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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.
When constructing outgoing requests from input strings, use stringent allowlists that limit the character set based on the expected value of the parameter in the request. This will indirectly limit the scope of an attack, but this technique is less important than proper output encoding and escaping.
Source: MITRE CWE-918
1,872 results · Clear filters · Feed
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Medium 4.0
Ghost: Server-side request forgery via DNS rebinding in external request handling
Ghost is a Node.js content management system. From 6.0.9 until 6.21.1, Ghost’s private-IP check for outbound HTTP requests could be bypassed via DNS rebinding, allowing an attacker to coerce the Ghost server into reaching hosts on internal networks through fe…
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Medium 5.4
Ghost: Mobiledoc image-size fetch SSRF
Ghost is a Node.js content management system. From 6.19.4 until 6.21.1, when re-rendering posts, Ghost would refetch missing image dimensions by issuing an outbound HTTP request to the URL stored on an image card — without restricting that URL to trusted imag…
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Medium 6.9
SSRF in Pentestify PDF generation endpoint via Host header
Server-Side Request Forgery (SSRF) (CWE-918) in the PDF generation endpoint GET /api/reports/{id}/pdf (backend/main.py) in ccyl13 Pentestify 1.0.0 and lower allows remote attackers to make the server issue requests to arbitrary internal or external URLs, incl…
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Medium 6.4
WP Meta SEO <= 4.5.18 - Authenticated (Contributor+) Server-Side Request Forgery via 'new_link' Parameter
The WP Meta SEO plugin for WordPress is vulnerable to Server-Side Request Forgery in all versions up to, and including, 4.5.18 via the 'new_link' parameter. This makes it possible for authenticated attackers, with contributor-level access and above, to make w…
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Medium 5.3
jackson-databind: InetSocketAddress deserialization triggers eager DNS resolution (SSRF)
jackson-databind contains the general-purpose data-binding functionality and tree-model for Jackson Data Processor. From 2.0.0 until 2.18.8, 2.21.4, and 3.1.4, JDKFromStringDeserializer constructed InetSocketAddress with new InetSocketAddress(host, port), whi…
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Medium 4.3
NocoDB: SSRF Protection Bypass in Notification Webhook Plugins (Slack, Discord, Mattermost, Teams)
NocoDB is software for building databases as spreadsheets. Prior to 2026.04.1, the request-filtering-agent SSRF protection was non-functional in the four notification webhook plugins (Slack, Discord, Mattermost, Teams) because httpAgent / httpsAgent were pass…
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Medium 5.3
NocoDB: Server-Side Request Forgery via Database Connection Host
NocoDB is software for building databases as spreadsheets. Prior to 2026.05.1, the connection-test endpoint opened a raw TCP socket to the user-supplied database host without resolving and range-checking the destination, so private and link-local addresses (i…
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Medium 5.1
NocoDB: Server-Side Request Forgery via Spreadsheet Fetch URL
NocoDB is software for building databases as spreadsheets. Prior to 2026.05.1, the spreadsheet-fetch endpoint (axiosRequestMake) accepted URLs whose path contained a permitted extension anywhere in the string, and applied a hand-rolled regex blocklist that om…
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Medium 5.1
NocoDB: Server-Side Request Forgery via Base Migration URL
NocoDB is software for building databases as spreadsheets. Prior to 2026.05.1, the base-migration endpoint accepted a caller-supplied URL that the migration worker dereferenced without enforcing protocol or destination, allowing scheme abuse (file:, ftp:, etc…
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Medium 6.9
NocoDB: Server-Side Request Forgery via Spreadsheet Import Endpoint
NocoDB is software for building databases as spreadsheets. Prior to 2026.05.1, the spreadsheet-import endpoint axiosRequestMake could be used as a generic HTTP proxy. Before the fix it was reachable unauthenticated, and its URL-extension allowlist was a regex…
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Medium 5.2
Deno: WebSocket API sandbox bypass via missing post-DNS check
Deno is a JavaScript, TypeScript, and WebAssembly runtime. Prior to 2.8.1, when a WebSocket connection was opened, Deno checked the destination hostname against --deny-net rules but did not re-check the IP addresses that hostname resolved to. An attacker-cont…
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Medium 5.2
Deno: `fetch()` API sandbox bypass via missing DNS resolution check
Deno is a JavaScript, TypeScript, and WebAssembly runtime. Prior to 2.8.1, when fetch() was called, Deno checked the destination hostname against --deny-net rules but did not re-check the IP addresses that hostname resolved to. An attacker-controlled script c…
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Medium 5.3
OpenStack Swift vulnerable to authenticated server-side request forgery
In OpenStack Swift before 2.37.2, proxy-server does not strip internal update headers (X-Container-Host, X-Container-Device, X-Delete-At-Host, X-Delete-At-Device) from client requests before forwarding them to object-servers. An authenticated user with write …
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Medium 6.0
Flowise - Server-Side Request Forgery via Execute Flow Base URL
Flowise before 3.1.0 contains a server-side request forgery vulnerability in the Execute Flow node that allows attackers to bypass security validation by providing intranet addresses through the base URL field. Attackers can initiate HTTP requests to internal…
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Medium 5.8
phpseclib: X.509 certificate validation sends attacker-controlled outbound requests (server-side request forgery) via Authority Information Access
phpseclib is a PHP secure communications library. From 0.1.1 until 1.0.30, 2.0.55, and 3.0.54, when an application validates an untrusted X.509 certificate with phpseclib, X509::validateSignature() reads a URL out of that certificate's Authority Information A…
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Medium 5.3
@astrojs/netlify broadens Astro image.remotePatterns in Netlify Image CDN config
@astrojs/netlify is an adapter that allows Astro to deploy your hybrid or server rendered site to Netlify. Prior to 7.0.13, @astrojs/netlify converts Astro image.remotePatterns into Netlify Image CDN images.remote_images regular expressions with broader seman…
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Medium 6.3
activepieces File URL file.ts handleUrlFile server-side request forgery
A vulnerability was detected in activepieces up to 0.83.0. This vulnerability affects the function handleUrlFile in the library packages/server/engine/src/lib/variables/processors/file.ts of the component File URL Handler. The manipulation results in server-s…
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Medium 6.3
BerriAI litellm MCP OpenAPI Spec Loader openapi_to_mcp_generator.py load_openapi_spec_async server-side request forgery
A weakness has been identified in BerriAI litellm up to 1.82.2. Affected by this vulnerability is the function load_openapi_spec_async of the file litellm/proxy/_experimental/mcp_server/openapi_to_mcp_generator.py of the component MCP OpenAPI Spec Loader. Thi…
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Medium 6.3
BerriAI litellm MCP Server Connection Testing rest_endpoints.py _execute_with_mcp_client server-side request forgery
A security vulnerability has been detected in BerriAI litellm up to 1.82.2. Affected by this vulnerability is the function _execute_with_mcp_client of the file litellm/proxy/_experimental/mcp_server/rest_endpoints.py of the component MCP Server Connection Tes…
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Medium 6.8
AVideo - Server-Side Request Forgery in Live/test.php via statsURL Parameter
AVideo through version 27.0 contains a server-side request forgery vulnerability in plugin/Live/test.php that allows authenticated administrators to read arbitrary URLs via the statsURL parameter, which lacks isSSRFSafeURL() validation and accepts requests to…
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Medium 5.4
Capgo - Server-Side Request Forgery via Webhook URL Validation
Capgo before 12.128.2 contains a server-side request forgery vulnerability in webhook URL validation that allows loopback and internal addresses. Organization admins can configure webhooks pointing to localhost or 127.0.0.1, and when triggered, the backend pe…
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Medium 5.3
Mercator CVE Configuration Vulnerable to Server-Side Request Forgery (SSRF)
Mercator is an open source web application that enables mapping of the information system. Prior to version 2025.05.19, a Server-Side Request Forgery (SSRF) vulnerability exists in Mercator's CVE configuration panel (`/admin/config/parameters`). The `testProv…
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Medium 6.3
Awx: automation-controller: awx: github webhook second-order ssrf via unvalidated statuses_url exfiltrates pat credential
A flaw was found in the AWX GitHub webhook integration. When processing GitHub pull_request webhooks, the controller stores the pull_request.statuses_url value from the webhook payload without validating that it points to a trusted GitHub API endpoint. If a j…
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Medium 6.5
PhpWeasyPrint vulnerable to SSRF and local file disclosure via the attachment option
PhpWeasyPrint is a PHP library allowing PDF generation from a URL or an HTML page. Prior to version 2.6.0, `pontedilana/php-weasyprint` fetches the content of option values server-side via `file_get_contents()` when the value looks like a URL, without restric…
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Medium 6.5CVE-2026-11989 Public exploit
Bit integrations <= 2.8.7 - Unauthenticated Server-Side Request Forgery via Form Field Upload Mapping
The Bit integrations – Form Integration, Webhook, Spreadsheets, CRM, LMS & Email Automation plugin for WordPress is vulnerable to Server-Side Request Forgery in all versions up to, and including, 2.8.7 via the upload_attachment. This makes it possible for una…
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Medium 6.4
Advanced Import: One-Click Demo Import for WordPress <= 1.4.6 - Authenticated (Author+) Server-Side Request Forgery via 'demo_file' Parameter
The Advanced Import plugin for WordPress is vulnerable to Server-Side Request Forgery in all versions up to, and including, 1.4.6. This is due to the plugin using wp_remote_get() to fetch a user-supplied URL without validating that the URL does not point to i…
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Medium 6.5
GeoServer has a Server-Side Request Forgery (SSRF) Vulnerability in its XML Entity Resolution
GeoServer is an open source server that allows users to share and edit geospatial data. Prior to versions 2.26.4 and 2.27.3, a GeoServer that uses `ENTITY_RESOLUTION_ALLOWLIST` may allow attacker to perform unauthenticated Server-Side Request Forgery (SSRF). …
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Medium 6.8
pydantic-ai: SSRF blocklist bypass via IPv4-compatible, SIIT/IVI, and local NAT64 IPv6 addresses (incomplete fix of CVE-2026-46678)
Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. In versions 1.56.0 through 1.101.0, 2.0.0b1, and 2.0.0b2, the cloud-metadata blocklist could be bypassed by encoding the metadata IP in an IPv6 transition form…
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Medium 6.5
OpenClaw < 2026.5.26 - Hostname Validation Bypass via Trailing-Dot Inconsistency
OpenClaw before 2026.5.26 contains a hostname validation vulnerability allowing attackers to bypass blocklist comparisons using trailing-dot notation in model or workspace-derived URLs. Attackers can exploit inconsistent hostname checks to reach destinations …
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Medium 4.4
WordPress PopAd Plugin <= 1.0.4 - Server Side Request Forgery (SSRF) Vulnerability
Administrator Server Side Request Forgery (SSRF) in PopAd <= 1.0.4 versions.
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Medium 6.3
universal-tool-calling-protocol python-utcp utcp-gql/utcp-websocket server-side request forgery
A vulnerability was detected in universal-tool-calling-protocol python-utcp 1.1.0. This affects an unknown function of the component utcp-gql/utcp-websocket. Performing a manipulation results in server-side request forgery. The attack can be initiated remotel…
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Medium 6.5
OpenClaw < 2026.5.2 - Credential Exposure via Model-Supplied Loopback URLs in message.action Forwarding
OpenClaw before 2026.5.2 contains a credential exposure vulnerability in message.action forwarding that allows model-controlled metadata to forward action payloads with Gateway credentials to attacker-supplied loopback URLs. Remote attackers can intercept Gat…
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Medium 6.4
Nezha Monitoring: Authenticated DDNS webhook configuration allows blind SSRF from the dashboard host
Nezha Monitoring is a self-hostable, lightweight, servers and websites monitoring and O&M tool. From version 0.20.0 to before version 2.0.10, an authenticated Nezha dashboard user can create or update a DDNS profile with provider webhook and configure an arbi…
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Medium 6.3
Koel: Server-Side Request Forgery (SSRF) in radio station creation due to missing validation bail
Koel is a free, open-source music streaming solution. Prior to version 9.7.1, Koel contains a Server-Side Request Forgery (SSRF) vulnerability in the radio station creation endpoint (POST /api/radio/stations). The url field validation rules are declared witho…
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Medium 6.5
aiograpi: Unsafe signup challenge path handling
aiograpi is an asynchronous Instagram API for Python. aiograpi versions before 0.9.10 accepted server-supplied signup challenge paths and used them to build request URLs before validating that the paths were relative Instagram API paths. If an attacker can in…
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Medium 5.3
Fediverse Embeds: Public-nonce SSRF via ftf_get_site_info AJAX action
Fediverse Embeds embeds fediverse posts on WordPress sites. Prior to version 1.5.9, Fediverse Embeds registered the unauthenticated AJAX action wp_ajax_nopriv_ftf_get_site_info (includes/Site_Info.php) that verified a nonce ftf-fediverse-embeds-nonce and then…
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Medium 5.4
IBM Langflow Desktop 1.0.0 - 1.9.2 DNS Rebinding Bypasses SSRF Protection Allowing Access to Internal Services
IBM Langflow Desktop 1.0.0 through 1.9.2 IBM Langflow is vulnerable to server-side request forgery (SSRF). This may allow an authenticated attacker to send unauthorized requests from the system, potentially leading to network enumeration or facilitating other…
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Medium 5.3
guzzlehttp/psr7 has Host Confusion via Authority Reinterpretation
guzzlehttp/psr7 is a PSR-7 HTTP message library implementation in PHP. Versions prior to 2.10.2 contain improper Host header validation when parsing raw HTTP request messages and when deriving a server request URI from server variables. An attacker can provid…
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Medium 5.3
Server-Side Request Forgery (SSRF) in GitLab
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.10 before 18.10.8, 18.11 before 18.11.5, and 19.0 before 19.0.2 that under certain conditions could have allowed an authenticated user to read arbitrary files from the Gitaly server…
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Medium 5.9
Weblate SSRF: outbound URL guard misses the NAT64 well-known prefix (64:ff9b::/96)
Weblate is a web based localization tool. From version 5.15 to before version 2026.6, Weblate's VCS_RESTRICT_PRIVATE did not properly account for some transitional IPv6 ranges, multicast addresses, or some semi-private IPv4 ranges, which allowed some addresse…