CVE-2026-67345

MaxKey through 4.1.12, fixed in commit ddbb72f, contains an insufficient redirect URI validation vulnerability in DefaultRedirectResolver.hostMatches that allows remote attackers to hijack OAuth 2.0 authorization codes by supplying a crafted redirecturi whose hostname suffix matches a registered...

DEBIAN-CVE-2026-54603

OAuth2 is a Ruby wrapper for the OAuth 2.0 and 2.1 authorization frameworks, including OpenID Connect OIDC. From 0.4.0 to 2.0.21, a protocol-relative redirect Location returned to OAuth2::Clientrequest overrides the request authority, so the bearer Authorization header is sent to an...

CVE-2026-54605

OAuth is a Ruby wrapper for the OAuth 1.0 and 1.0a protocols, providing clients and servers. From 0.5.5 to 1.1.5, OAuth::Consumertokenrequest parses the raw Location header of a 300 to 399 redirect returned by the OAuth server and follows the redirect recursively, which can mutate the consumer's...

DEBIAN-CVE-2026-41479

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.6.10 and 1.7.1, Authlib's OAuth 2.0 authorization endpoint can be turned into an unauthenticated open redirect when a request uses an unsupported responsetype and supplies an attacker-controlled redirecturi. The...

Exploit for CVE-2026-48611

CVE-2026-48611 – phpBB OAuth Account Hijacking Exploit Unau...

PT-2026-48827

Name of the Vulnerable Software and Affected Versions Okta affected versions not specified Description Improper state verification in the OAuth implementation allows an attacker to manipulate the authentication flow. This can lead to a victim's account being linked to an account controlled by the...

Open Redirect

Overview oauth is a ruby gem that implements both OAuth clients and servers in Ruby applications. Affected versions of this package are vulnerable to Open Redirect via the tokenrequest function in the token endpoint redirect handling. An attacker can obtain sensitive OAuth request metadata, such ...

Authlib OAuth 2.0 has Open Redirect in Authorization API that allows attacker-controlled redirect_uri through unsupported response_type

Summary Authlib's OAuth 2.0 authorization endpoint can be turned into an unauthenticated open redirect when a request uses an unsupported responsetype and supplies an attacker-controlled redirecturi. The vulnerable behavior happens before client lookup and before any redirect URI validation. As a...

The vulnerability of the OAuth protocol implementation of the artificial intelligence-based platform LibreChat, which allows a perpetrator to gain unauthorized access to protected information.

The vulnerability of the OAuth protocol implementation of the artificial intelligence-based LibreChat platform is related to the lack of authentication for a critical function. Exploiting this vulnerability could allow a malicious actor to gain unauthorized access to protected information...

The vulnerability of the OAuth authorization protocol implemented by the AI agent OpenClaw (formerly known as ClawdBot or MoltBot) allows a attacker to perform a CSRF attack.

The vulnerability of the OAuth authorization protocol implementation of the AI agent OpenClaw formerly known as ClawdBot or MoltBot is related to the manipulation of cross-site requests. Exploiting this vulnerability allows a malicious actor to perform a CSRF attack remotely...

PT-2026-55346

Casdoor versions 2.362.0 and earlier do not verify that a JWT used for token exchange is still active. The GetTokenExchangeToken function in object/token oauth.go validates the JWT signature and parses its claims, but never queries the Token table to verify whether the subject token has been...

The vulnerability of the JOSE library Authlib implementation for OAuth and OpenID Connect servers lies in the exposure of information due to inconsistencies, allowing attackers to gain unauthorized access to protected information.

The vulnerability of the JOSE library Authlib implementation for OAuth and OpenID Connect servers is related to the disclosure of information due to incompatibility. Exploiting this vulnerability could allow an attacker operating remotely to gain unauthorized access to protected information...

A First Measurement Study on Authentication Security in Real-World Remote MCP Servers

The Model Context Protocol MCP is emerging as a common interface connecting large language models LLMs with external services. Remote deployments are becoming increasingly important as agents connect to user-linked online services, such as social, productivity, and financial services. In such...

Authlib: Cross-site request forging when using cache

Summary There is no CSRF protection on the cache feature on most integrations clients. Details In authlib.integrations.starletteclient.OAuth, no CSRF protection is set up when using the cache parameter. When not using the cache parameter, the use of SessionMiddleware ties the client to the auth...

CVE-2026-40575

creationtimestamp| type| source ---|---|--- 2026-04-16 11:06:42+00:00| seen| https://ccb.belgium.be/advisories/warning-critical-authentication-bypass-oauth2-can-lead-unauthorized-data-access-patch 2026-04-22 01:19:23+00:00| seen| Telegram/LUR06ONloRlViUIW27ojzHZG9BE33b4Dag-8VffcgXgN8 2026-04-22...

Use of GET Request Method With Sensitive Query Strings

Overview Affected versions of this package are vulnerable to Use of GET Request Method With Sensitive Query Strings in the OAuth provider callback flow. An attacker can gain unauthorized access to sensitive information by intercepting refresh tokens exposed in URL query parameters through browser...

PT-2026-26609

Name of the Vulnerable Software and Affected Versions versions prior to 2026-31381 Description An attacker can extract user email addresses PII exposed in base64 encoding via the state parameter in the OAuth callback URL. The vulnerability involves the exposure of Personally Identifiable...

CVE-2026-27962

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a JWK Header Injection vulnerability in authlib's JWS implementation allows an unauthenticated attacker to forge arbitrary JWT tokens that pass signature verification. When key=None is passed to any...

EUVD-2025-208759

FastMCP OAuth Proxy token reuse across MCP servers...

CVE-2026-31944

LibreChat’s breach involves the MCP OAuth callback endpoint incorrectly accepting redirects without verifying the user session or initiator. From versions 0.8.2 through 0.8.2-rc3, an attacker can lure a victim to complete the OAuth flow, causing the victim’s OAuth tokens to be stored on the attac...