Weakness (CWE)
CWE-306: Missing Authentication for Critical Functionality
The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.
How to prevent it (5 mitigations)
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Architecture and Design
Divide the software into anonymous, normal, privileged, and administrative areas. Identify which of these areas require a proven user identity, and use a centralized authentication capability.
Identify all potential communication channels, or other means of interaction with the software, to ensure that all channels are appropriately protected, including those channels that are assumed to be accessible only by authorized parties. Developers sometimes perform authentication at the primary channel, but open up a secondary channel that is assumed to be private. For example, a login mechanism may be listening on one network port, but after successful authentication, it may open up a second port where it waits for the connection, but avoids authentication because it assumes that only the authenticated party will connect to the port.
In general, if the software or protocol allows a single session or user state to persist across multiple connections or channels, authentication and appropriate credential management need to be used throughout.
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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.
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Architecture and Design
Where possible, avoid implementing custom, "grow-your-own" authentication routines and consider using authentication capabilities as provided by the surrounding framework, operating system, or environment. These capabilities may avoid common weaknesses that are unique to authentication; support automatic auditing and tracking; and make it easier to provide a clear separation between authentication tasks and authorization tasks.
In environments such as the World Wide Web, the line between authentication and authorization is sometimes blurred. If custom authentication routines are required instead of those provided by the server, then these routines must be applied to every single page, since these pages could be requested directly.
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Architecture and Design
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
For example, consider using libraries with authentication capabilities such as OpenSSL or the ESAPI Authenticator [REF-45].
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Implementation, System Configuration, Operation
When storing data in the cloud (e.g., S3 buckets, Azure blobs, Google Cloud Storage, etc.), use the provider's controls to require strong authentication for users who should be allowed to access the data [REF-1297] [REF-1298] [REF-1302].
Source: MITRE CWE-306
37 results · Clear filters · Feed
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Medium 5.3
Microsoft SharePoint Server Elevation of Privilege Vulnerability
Missing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.
KEV Jul 14, 2026 -
High 8.8
LiteLLM: MCP Authentication Bypass via OAuth2 Passthrough Fallback
LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. Prior to 1.84.0, LiteLLM's MCP Streamable HTTP endpoint allowed an unauthenticated attacker to use a fabricated Authorization header to trigger an OAuth2 passthrough fallbac…
KEV Sep 2, 2026 -
Critical 9.8
Vulnerability in the PeopleSoft Enterprise PeopleTools product of Oracle PeopleSoft (component: Updates Environment Man…
KEV Jun 12, 2026 -
Critical 9.8
Unauthenticated Arbitrary File Creation and Truncation in a PostgreSQL Sidecar Service Endpoint in Splunk Enterprise
In Splunk Enterprise 10.2 versions below 10.2.4 and 10 versions below 10.0.7, an unauthenticated user could create or truncate arbitrary files through a PostgreSQL sidecar service endpoint. The vulnerability exists because the PostgreSQL sidecar service endpo…
KEV Jun 18, 2026 -
Critical 9.8
Vulnerability in the Oracle Payments product of Oracle E-Business Suite (component: File Transmission). Supported versi…
KEV Jul 15, 2026 -
Critical 9.8
WebPros cPanel and WHM Authentication Bypass via Login Flow
cPanel and WHM versions after 11.40 contain an authentication bypass vulnerability in the login flow that allows unauthenticated remote attackers to gain unauthorized access to the control panel.
KEV Apr 30, 2026 -
Critical 9.3
marimo Affected by Pre-Auth Remote Code Execution via Terminal WebSocket Authentication Bypass
marimo is a reactive Python notebook. Prior to 0.23.0, Marimo has a Pre-Auth RCE vulnerability. The terminal WebSocket endpoint /terminal/ws lacks authentication validation, allowing an unauthenticated attacker to obtain a full PTY shell and execute arbitrary…
KEV Apr 23, 2026 -
Critical 9.3
Langflow has Unauthenticated Remote Code Execution via Public Flow Build Endpoint
Langflow is a tool for building and deploying AI-powered agents and workflows. In versions prior to 1.9.0, the POST /api/v1/build_public_tmp/{flow_id}/flow endpoint allows building public flows without requiring authentication. When the optional data paramete…
KEV Mar 25, 2026 -
Critical 9.3
SmarterTools SmarterMail < Build 9511 Unauthenticated RCE via ConnectToHub API
SmarterTools SmarterMail versions prior to build 9511 contain an unauthenticated remote code execution vulnerability in the ConnectToHub API method. The attacker could point the SmarterMail to the malicious HTTP server, which serves the malicious OS command. …
KEV Feb 5, 2026 -
Critical 9.8
Vulnerability in the Identity Manager product of Oracle Fusion Middleware (component: REST WebServices). Supported vers…
KEV Nov 21, 2025 -
Critical 9.3
Commvault Command Center Innovation Release <= 11.38.25 Unathenticated Install Package Path Traversal
The Commvault Command Center Innovation Release allows an unauthenticated actor to upload ZIP files that represent install packages that, when expanded by the target server, are vulnerable to path traversal vulnerability that can result in Remote Code Executi…
KEV May 2, 2025 -
Critical 10.0
Erlang/OTP SSH Vulnerable to Pre-Authentication RCE
Erlang/OTP is a set of libraries for the Erlang programming language. Prior to versions OTP-27.3.3, OTP-26.2.5.11, and OTP-25.3.2.20, a SSH server may allow an attacker to perform unauthenticated remote code execution (RCE). By exploiting a flaw in SSH protoc…
KEV Jun 9, 2025 -
Critical 9.8
Langflow < 1.3.0 Unauthenticated RCE via /api/v1/validate/code
Langflow versions prior to 1.3.0 are susceptible to code injection in the /api/v1/validate/code endpoint. A remote and unauthenticated attacker can send crafted HTTP requests to execute arbitrary code.
KEV May 5, 2025 -
Medium 5.9
PAN-OS: Authentication Bypass in the Management Web Interface
An authentication bypass in the Palo Alto Networks PAN-OS software enables an unauthenticated attacker with network access to the management web interface to bypass the authentication otherwise required by the PAN-OS management web interface and invoke certai…
KEV Feb 18, 2025 -
Critical 9.8
ProjectSend Unauthenticated Configuration Modification
ProjectSend versions prior to r1720 are affected by an improper authentication vulnerability. Remote, unauthenticated attackers can exploit this flaw by sending crafted HTTP requests to options.php, enabling unauthorized modification of the application's conf…
KEV Dec 3, 2024 -
Medium 5.9
PAN-OS: Authentication Bypass in the Management Web Interface (PAN-SA-2024-0015)
An authentication bypass in Palo Alto Networks PAN-OS software enables an unauthenticated attacker with network access to the management web interface to gain PAN-OS administrator privileges to perform administrative actions, tamper with the configuration, or…
KEV Nov 18, 2024 -
Critical 10.0
upgrademysqlstatus in databases/views.py in CyberPanel (aka Cyber Panel) before 5b08cd6 allows remote attackers to bypa…
KEV Nov 7, 2024 -
Critical 9.8
A missing authentication for critical function in FortiManager 7.6.0, FortiManager 7.4.0 through 7.4.4, FortiManager 7.…
KEV Oct 23, 2024 -
Critical 9.3
Expedition: Missing Authentication Leads to Admin Account Takeover
Missing authentication for a critical function in Palo Alto Networks Expedition can lead to an Expedition admin account takeover for attackers with network access to Expedition. Note: Expedition is a tool aiding in configuration migration, tuning, and enrichm…
KEV Nov 7, 2024 -
Medium 5.3
Junos OS: SRX Series: A vulnerability in J-Web allows an unauthenticated attacker to upload arbitrary files
A Missing Authentication for Critical Function vulnerability in Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based attacker to cause limited impact to the file system integrity. With a specific request to user.php that doesn't re…
KEV Nov 13, 2023 -
High 7.5
Vulnerability in Veeam Backup & Replication component allows encrypted credentials stored in the configuration database…
KEV Aug 22, 2023 -
Critical 9.8
TerraMaster NAS 4.2.29 and earlier allows remote attackers to discover the administrative password by sending "User-Age…
KEV Feb 10, 2023 -
High 7.5
Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: Core). Supported versions t…
KEV May 1, 2023 -
Critical 9.8
Vulnerability in the Oracle Web Applications Desktop Integrator product of Oracle E-Business Suite (component: Upload).…
KEV Feb 2, 2023 -
Critical 9.8
On F5 BIG-IP 16.1.x versions prior to 16.1.2.2, 15.1.x versions prior to 15.1.5.1, 14.1.x versions prior to 14.1.4.6, 1…
KEV May 10, 2022 -
Critical 9.8
Vulnerability in the Oracle Access Manager product of Oracle Fusion Middleware (component: OpenSSO Agent). Supported ve…
KEV Nov 28, 2022 -
Critical 9.8
Zoho ManageEngine ServiceDesk Plus before 11306, ServiceDesk Plus MSP before 10530, and SupportCenter Plus before 11014…
KEV Dec 1, 2021 -
High 8.5
XStream is vulnerable to a Remote Command Execution attack
XStream is a simple library to serialize objects to XML and back again. In affected versions this vulnerability may allow a remote attacker has sufficient rights to execute commands of the host only by manipulating the processed input stream. No user is affec…
KEV Mar 10, 2023 -
Critical 9.8
Authentication bypass in Apache Airflow
The previous default setting for Airflow's Experimental API was to allow all API requests without authentication, but this poses security risks to users who miss this fact. From Airflow 1.10.11 the default has been changed to deny all requests by default and …
KEV Jan 18, 2022 -
High 8.8
TP-Link TL-WA855RE V5 20200415-rel37464 devices allow an unauthenticated attacker (on the same network) to submit a TDD…
KEV Sep 2, 2025 -
Medium 6.5
A Default Configuration vulnerability in FortiOS may allow an unauthenticated attacker on the same subnet to intercept …
KEV Nov 3, 2021 -
Critical 10.0
SAP NetWeaver AS JAVA (LM Configuration Wizard), versions - 7.30, 7.31, 7.40, 7.50, does not perform an authentication …
KEV Nov 3, 2021 -
Critical 9.8
SaltStack Salt Unauthenticated Remote Code Execution
An issue was discovered in SaltStack Salt before 2019.2.4 and 3000 before 3000.2. The salt-master process ClearFuncs class does not properly validate method calls. This allows a remote user to access some methods without authentication. These methods can be u…
KEV Nov 3, 2021 -
Critical 9.8
Under certain conditions, vmdir that ships with VMware vCenter Server, as part of an embedded or external Platform Serv…
KEV Nov 3, 2021 -
Critical 10.0
SAP Solution Manager (User Experience Monitoring), version- 7.2, due to Missing Authentication Check does not perform a…
KEV Nov 3, 2021 -
High 8.8
ThinkPHP before 3.2.4, as used in Open Source BMS v1.1.1 and other products, allows Remote Command Execution via public…
KEV Nov 3, 2021 -
High 7.5
Vulnerability in the Oracle WebLogic Server component of Oracle Fusion Middleware (subcomponent: WLS Security). Support…
KEV Feb 10, 2022