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
669 results · Clear filters · Feed
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Medium 6.9
Symfony: Mailjet Mailer Webhook Parser Never Verifies the Configured Secret — Unauthenticated Webhook Event Injection
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 6.4.40, 7.4.12, and 8.0.12, the Mailjet mailer bridge and LOX24 notifier bridge webhook parsers received configured webhook secrets but did not verify t…
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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 -
Medium 6.1
DNS Client Tampering Vulnerability
Missing authentication for critical function in Microsoft Windows DNS allows an authorized attacker to perform tampering locally.
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Medium 4.8
Deloitte AI Assist for Customer unauthenticated RAG corpus read and write
Deloitte AI Assist for Customer exposed unauthenticated API endpoints that allowed an attacker with knowledge of additional parameters to read from or inject content into the retrieval-augmented generation (RAG) corpus. On 2026-03-25, AI Assist for Customer r…
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Medium 5.3
Deloitte AI Assist for Customer unauthenticated configuration write
Deloitte AI Assist for Customer accepted unauthenticated POST requests through public-facing API endpoints that allowed a remote attacker to make limited additions to the configuration. These additions were not used by the system. On 2026-03-25, AI Assist for…
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Medium 5.3
@arikusi/deepseek-mcp-server Missing Authentication on Self-Hosted HTTP MCP Endpoint
DeepSeek MCP Server is an MCP server for DeepSeek V4. Starting in version 1.4.2 and prior to version 1.8.0, the self-hosted HTTP transport of `@arikusi/deepseek-mcp-server` exposes `POST /mcp` without any authentication: `createMcpExpressApp` is called withou…
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Medium 4.5
PAN-OS: Authentication Bypass Vulnerability in Large Scale VPN (LSVPN)
An authentication bypass vulnerability in Large Scale VPN ( LSVPN) functionality of Palo Alto Networks PAN-OS software allows an attacker with network access to bypass security restrictions and establish an unauthorized site-to-site VPN connection. Panorama, …
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Medium 5.3
Superior Court of California Hearing Reminder Service unauthenticated information disclosure
The Superior Court of California Hearing Reminder Service at https://www.hrs.courts.ca.gov exposes an API endpoint that returns court reminder records containing potentially sensitive information without authentication.
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Medium 6.5
mettle sendportal APIv1 Webhooks mailjet missing authentication
A vulnerability has been found in mettle sendportal up to 3.0.1. This issue affects the function sendgrid/postmark/postal/mailjet of the component APIv1 Webhooks. The manipulation leads to missing authentication. The attack is possible to be carried out remot…
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Medium 5.3
Missing authentication in SSH keys synchronization endpoint in Guardian/CMC before 26.2.0
A Missing Authentication vulnerability was discovered in the SSH keys synchronization endpoint. An unauthenticated attacker can send a request to the SSH keys synchronization endpoint and obtain the list of users that have uploaded their public SSH keys, thei…
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Medium 4.4
CoreWCF: Unix Domain Socket PosixIdentity transport accepts connections that skip the security upgrade
CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. Prior to 1.8.1 and 1.9.1, a CoreWCF service hosted on Unix Domain Sockets with PosixIdentity client credentials can accept connections that skip the application/unix…
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Medium 6.8
Midscene Bridge Server - Session Hijack via Unauthenticated WebSocket
Midscene Bridge Server through 1.10.3, fixed in commit 86f4118, contains a missing authentication and CORS misconfiguration vulnerability that allows unauthenticated remote attackers to hijack active bridge sessions by opening a cross-origin WebSocket connect…
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Medium 6.3
Trustyai-service-operator: trustyai service operator: gorch port bypass when auth is enabled
A flaw was found in the gorch service template, which is part of the trustyai-service-operator. Even when authentication is enabled, the gorch service exposes unproxied orchestrator and detector metrics ports. This allows any pod on the cluster network to dir…
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Medium 6.3
Trustyai-service-operator: trustyai service operator: unauthenticated access to ai guardrails and orchestrator apis
A flaw was found in the TrustyAI Service Operator. When deploying services like gorch or NemoGuardrails, if a specific security setting is not enabled, these services can expose their communication channels without requiring users to prove their identity. Thi…
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Medium 6.5
ha-mcp: Add-on settings and policy routes are reachable without authentication at the bare root path
### Summary In add-on mode, the ha-mcp settings UI routes are mounted both under the MCP secret path **and** at the bare root of the published port (`:9583`), so Home Assistant ingress can serve the "Open Web UI" button. The root-mounted routes perform no aut…
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Medium 6.9CVE-2026-53647 Public exploit
FOSSBilling vulnerable to unauthenticated API key configuration disclosure via guest Serviceapikey get_info endpoint
FOSSBilling is a free, open-source billing and client management system. In versions 0.5.3 through 0.7.2, the Guest `serviceapikey/get_info` API endpoint is accessible without authentication. Any caller with a valid API key can retrieve all custom configurati…
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Medium 6.5
Coolify unauthenticated feedback endpoint allows Discord webhook abuse
Coolify is an open-source and self-hostable tool for managing servers, applications, and databases. Prior to 4.0.0-beta.474, POST /api/feedback has no authentication, no rate limiting, and no input validation, allowing arbitrary content to be forwarded direct…
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Medium 6.5
zhayujie chatgpt-on-wechat CowAgent wx Endpoint common.py verify_server missing authentication
A weakness has been identified in zhayujie chatgpt-on-wechat CowAgent 2.1.0. This issue affects the function verify_server of the file channel/wechatmp/common.py of the component wx Endpoint. This manipulation of the argument wechatmp_token causes missing aut…
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Medium 6.5
Presenton < 0.8.8-beta - Authentication Bypass of Session Auth via Unprotected MCP Endpoint
Presenton before 0.8.8-beta bundles an MCP server that, on server/Docker deployments configured with session authentication (AUTH_USERNAME/AUTH_PASSWORD), is reachable unauthenticated at /mcp because the nginx front-end does not apply the auth_request gate to…
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Medium 6.9
FOSSBilling: Unauthenticated update patcher endpoint allows remote maintenance execution
FOSSBilling is a free, open-source billing and client management system. In versions 0.5.4 through 0.7.2, the /run-patcher maintenance endpoint in FOSSBilling was accessible without authentication, which allowed unauthenticated remote users to trigger update …
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Medium 5.9
LibreChat: 2FA Backup Code Regeneration Without OTP Verification Allows 2FA Bypass
LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.4-rc1, the POST /api/auth/2fa/backup/regenerate endpoint regenerates all 2FA backup codes without requiring any TOTP token or existing backup code verification. An attack…
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Medium 5.3
LibreChat: 2FA Re-enrollment Allows Full Account 2FA Takeover Without OTP Verification
LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.4-rc1, the GET /api/auth/2fa/enable endpoint can be called by an authenticated user (or attacker with a stolen session) even when 2FA is already fully enabled on the acco…
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Medium 6.7
Missing authentication for critical function vulnerability in HYPR Passwordless on Windows allows Credentials Intercept…
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Medium 5.9
SiYuan: Unauthenticated SQLite Data Exfiltration via Template Injection in /api/icon/getDynamicIcon
SiYuan is an open-source personal knowledge management system. Prior to 3.7.0, the /api/icon/getDynamicIcon endpoint is explicitly excluded from authentication in SiYuan's kernel router (router.go, "不需要鉴权" -- no auth needed). When called with type=8 and a val…
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Medium 6.5
Crawl4AI - Unauthenticated Access to Monitor Endpoints via Docker API Server
Crawl4AI before 0.8.7 contains an authentication bypass vulnerability in the monitor router endpoints that allows unauthenticated attackers to access destructive operations. Remote attackers can invoke the /monitor/actions/cleanup endpoint and manipulate moni…
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Medium 5.3
Capgo - Missing Authentication Middleware on GET /private/role_bindings Endpoint
Capgo (backend Supabase edge functions) before 12.128.2 does not apply the global authentication middleware to the GET /private/role_bindings/:org_id endpoint, unlike the POST and DELETE role_bindings routes, so unauthenticated requests reach the handler inst…
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Medium 6.9
Information leak via “diff” methods in qSnapper
Lack of authentication when using the "snapshot diff" functions in qSnapper before version 1.3.3 allowed a local attacker to see otherwise read protected information.
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Medium 6.4
Mattermost Jira plugin had unauthenticated {{/ac/installed}} lifecycle callback during pending Jira Cloud install
Mattermost versions 11.7.x <= 11.7.0, 11.6.x <= 11.6.2, 11.5.x <= 11.5.5, 10.11.x <= 10.11.17 fail to authenticate Atlassian Connect installed callbacks, allowing a remote unauthenticated attacker to inject a rogue sharedSecret and disrupt the Jira integratio…
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Medium 5.3
Capgo - Denial of Service via Unauthenticated OPTIONS Request to /build/upload Endpoint
Capgo before 12.128.2 contains an authentication bypass vulnerability in the /build/upload/:jobId/* endpoint that allows unauthenticated attackers to trigger consistent 500 errors. Remote attackers can send OPTIONS requests to bypass authentication middleware…
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Medium 6.5
AVideo - Unauthenticated PGP Message Decryption via decryptMessage.json.php Endpoint
AVideo through version 25.0 contains an authentication bypass vulnerability in the decryptMessage.json.php endpoint that allows unauthenticated users to decrypt PGP messages. Remote attackers can submit private keys, ciphertext, and passphrases to perform ser…
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Medium 6.0
A broken authorization boundary in the RTSP media delivery pipeline of Shenzhen Liandian Communication Technology LTD V…
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Medium 6.1
Missing Authentication for Critical Function vulnerability in RTI Connext Professional (Security Plugins) allows Identity Spoofing.
Missing Authentication for Critical Function vulnerability in RTI Connext Professional (Security Plugins) allows Identity Spoofing. This issue affects Connext Professional: from 7.4.0 before 7.7.0, from 7.0.0 before 7.3.1.6, from 6.1.0 before 6.1.*, from 6.0.…
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Medium 6.0
Missing Authentication for Critical Function vulnerability in RTI Connext Professional (Security Plugins) allows Fake the Source of Data.
Missing Authentication for Critical Function vulnerability in RTI Connext Professional (Security Plugins) allows Fake the Source of Data. This issue affects Connext Professional: from 7.4.0 before 7.7.0, from 7.0.0 before 7.3.1.3, from 6.1.0 before 6.1.*, fro…
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Medium 6.5
Aqara Developer Portal insecure authentication token
The Aqara Cloud Developer Portal (developer.aqara.com) issued a developer token to any email address supplied by the attacker. This is an instance of "CWE-306: Missing Authentication for Critical Function" with an estimated CVSS of CVSS:3.1/AV:N/AC:L/PR:N/UI:…
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Medium 5.3
Improper access control on the API documentation endpoint in PowerShell Universal
Improper access control in Devolutions PowerShell Universal 2026.1.7 and earlier allows an unauthenticated remote attacker to obtain the OpenAPI specification of user-defined REST endpoints.
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Medium 5.3
IEI Integration Corp｜ iRM-IEI Remote Management - Missing Authentication
The iRM-IEI Remote Management developed by IEI Integration Corp has a Missing Authentication vulnerability, allowing unauthenticated remote attackers to exploit a specific functionality to obtain partial system configuration information.
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Medium 6.8CVE-2026-50507 Public exploit
Windows BitLocker Security Feature Bypass Vulnerability
Missing authentication for critical function in Windows BitLocker allows an unauthorized attacker to bypass a security feature with a physical attack.
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Medium 5.6
Insufficient authentication and input validation in certain NETGEAR products
Insufficient authentication and input validation in the listed NETGEAR models allow users connected to the local network to execute commands impacting the product's confidentiality or change certain configurations.
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Medium 5.9
Inappropriate implementation in DevTools in Google Chrome prior to 149.0.7827.53 allowed an attacker who convinced a us…
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Medium 6.3
Bottelet DaybydayCRM Setting missing authentication
A vulnerability was detected in Bottelet DaybydayCRM up to 2.2.1. Affected is an unknown function of the component Setting Handler. Performing a manipulation results in missing authentication. Remote exploitation of the attack is possible. It is recommended t…