CVE-2026-67335 better-auth before 1.6.2 OAuth State Validation Bypass

better-auth versions before 1.6.2 fail to validate the OAuth state parameter against the stored nonce when using cookie-backed state storage without PKCE. Attackers can forge the state parameter and supply an attacker-controlled authorization code to create authenticated sessions bound to the...

CVE-2026-54605 OAuth: Cross-origin token-request redirects can expose signed request metadata

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...

SUSE CVE-2026-57219

RabbitMQ is a messaging and streaming broker. Prior to 3.13.15, 4.0.20, 4.1.11, and 4.2.6, the obsolete GET /api/auth endpoint can disclose the OAuth 2 client secret on RabbitMQ installations configured with management.oauthclientsecret, exposing credentials to unauthenticated callers when the...

CVE-2026-44761

SAP Commerce Cloud could retain a sample OAuth2 client with publicly documented sample credentials originating from sample configuration provided in SAP Help Portal documentation. If left unchanged, an unauthenticated attacker could use these well-known credentials to obtain a valid access token...

CVE-2026-14612

The CVE concerns FreeIPA’s ipa-otpd daemon, specifically the OAuth2 device authorization handler. Two off-by-one errors can trigger out-of-bounds memory access when handling an oversized response from a configured external OAuth2/OIDC Identity Provider. Exploitation requires FreeIPA to be configu...

CVE-2026-49757 OAuth2/OIDC account takeover in AshAuthentication via email-based user matching

Authentication Bypass by Spoofing vulnerability in team-alembic AshAuthentication allows account takeover of local users via OAuth2/OIDC sign-in. AshAuthentication's OAuth2 and OIDC family strategies matched the local user by email address an upsert on the email field, or a user-defined sign-in...

CVE-2026-42073

Summary: CVE-2026-42073 affects OpenClaude MCP OAuth callback flow. A logic flaw in the conditional order allows an attacker to bypass the CSRF state check when an error parameter is present, forcing the local OAuth callback server to shut down (DoS) without knowing the expected state. Affected c...

GHSA-PQ7P-MC74-G65W PocketBase vulnerable to account pre-hijacking via OAuth2 unverfied->verified autolinking upgrade

A pre-hijacking issue was discovered with the OAuth2 autolinking by Alardiians. In some situations, if an attacker knows the email address of the victim they can create and link an unverified PocketBase user in advance by authenticating with one of the OAuth2 app providers, e.g. "A". When the...

EUVD-2026-22758

OAuth2 Proxy's session cookies are not cleared when rendering sign-in page...

Deserialization of Untrusted Data

Overview devcode-it/openstamanager is a management software for technical assistance and electronic invoicing Affected versions of this package are vulnerable to Deserialization of Untrusted Data in the unserialize process of the accesstoken field in the OAuth2 configuration flow, where...

EUVD-2026-16563

Dovecot OTP authentication is vulnerable to replay attack under specific conditions. If auth cache is enabled, and username is altered in passdb, then OTP credentials can be cached so that same OTP reply is valid. An attacker able to observe an OTP exchange is able to log in as the user. If...

ALPINE-CVE-2026-27855

Dovecot OTP authentication is vulnerable to replay attack under specific conditions. If auth cache is enabled, and username is altered in passdb, then OTP credentials can be cached so that same OTP reply is valid. An attacker able to observe an OTP exchange is able to log in as the user. If...

CVE-2026-33720

n8n is an open source workflow automation platform. Prior to version 2.8.0, when the N8NSKIPAUTHONOAUTHCALLBACK environment variable is set to true, the OAuth callback handler skips ownership verification of the OAuth state parameter. This allows an attacker to trick a victim into completing an...

GHSA-FMFG-9G7C-3VQ7 ha-mcp OAuth 2.1 DCR mode enables network reconnaissance via an error oracle

Summary The ha-mcp OAuth consent form beta feature accepts a user-supplied haurl and makes a server-side HTTP request to haurl/api/config with no URL validation. An unauthenticated attacker can submit arbitrary URLs to perform internal network reconnaissance via an error oracle. Two additional co...

UBUNTU-CVE-2026-28802

Authlib is a Python library which builds OAuth and OpenID Connect servers. From version 1.6.5 to before version 1.6.7, previous tests involving passing a malicious JWT containing alg: none and an empty signature was passing the signature verification step without any changes to the application co...

CVE-2026-28802

Authlib is a Python library which builds OAuth and OpenID Connect servers. From version 1.6.5 to before version 1.6.7, previous tests involving passing a malicious JWT containing alg: none and an empty signature was passing the signature verification step without any changes to the application co...

CVE-2026-1693

The OAuth grant type Resource Owner Password Credentials ROPC flow is still used by the werbservices used by the WebVue, WebScheduler, TouchVue and Snapvue features of PcVue in version 12.0.0 through 16.3.3 included despite being deprecated. It might allow a remote attacker to steal user...

CVE-2025-66040

Spotipy is a Python library for the Spotify Web API. Prior to version 2.25.2, there is a cross-site scripting XSS vulnerability in the OAuth callback server that allows for JavaScript injection through the unsanitized error parameter. Attackers can execute arbitrary JavaScript in the user's brows...

Cross-site Scripting (XSS)

Overview spotipy is an A light weight Python library for the Spotify Web API Affected versions of this package are vulnerable to Cross-site Scripting XSS via the RequestHandler.doGET function due to the error parameter in the OAuth callback server. An attacker can execute arbitrary JavaScript in...

Unintended Proxy or Intermediary ('Confused Deputy')

Overview fastmcp is a The fast, Pythonic way to build MCP servers and clients. Affected versions of this package are vulnerable to Unintended Proxy or Intermediary 'Confused Deputy' during the authentication with OAuth providers that don't support Dynamic Client Registration DCR. An attacker can...