Cross-site Scripting (XSS)

Overview Affected versions of this package are vulnerable to Cross-site Scripting XSS in the GitHub OAuth callback handler when the refreshInterval query parameter is embedded verbatim into an error message and rendered unescaped into HTML. An attacker can execute arbitrary JavaScript in the...

CVE-2026-4828

Improper authentication in the OAuth login functionality in Devolutions Server 2026.1.11 and earlier allows a remote attacker with valid credentials to bypass multi-factor authentication via a crafted login request...

Tinyauth has OAuth account confusion via shared mutable state on singleton service instances

Summary All three OAuth service implementations GenericOAuthService, GithubOAuthService, GoogleOAuthService store PKCE verifiers and access tokens as mutable struct fields on singleton instances shared across all concurrent requests. When two users initiate OAuth login for the same provider...

CVE-2026-4828

Summary (CVE-2026-4828) : Devolutions Server prior to 2026.1.12 is affected by an improper authentication flaw in the OAuth login flow that enables a remote attacker with valid credentials to bypass MFA via a crafted login request. Affected versions include 2026.1.11 and earlier. The issue is mit...

CVE-2026-34215 Parse Server: Auth data exposed via verify password endpoint

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.63 and 9.7.0-alpha.7, the verify password endpoint returns unsanitized authentication data, including MFA TOTP secrets, recovery codes, and OAuth access tokens. An attacke...

PT-2026-28610

Name of the Vulnerable Software and Affected Versions Parse Server versions prior to 8.6.63 Parse Server versions prior to 9.7.0-alpha.7 Description The verify password endpoint returns unsanitized authentication data, including MFA TOTP secrets, recovery codes, and OAuth access tokens. An attack...

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 Has Authorization Bypass in OAuth Callback via N8N_SKIP_AUTH_ON_OAUTH_CALLBACK

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...

EUVD-2026-13684

An attacker can extract user email addresses PII exposed in base64 encoding via the state parameter in the OAuth callback URL...

EUVD-2025-208759

FastMCP OAuth Proxy token reuse across MCP servers...

CVE-2026-31944

LibreChat is a ChatGPT clone with additional features. From 0.8.2 to 0.8.2-rc3, The MCP Model Context Protocol OAuth callback endpoint accepts the redirect from the identity provider and stores OAuth tokens for the user who initiated the flow, without verifying that the browser hitting the redire...

PT-2026-25366

LibreChat is a ChatGPT clone with additional features. From 0.8.2 to 0.8.2-rc3, The MCP Model Context Protocol OAuth callback endpoint accepts the redirect from the identity provider and stores OAuth tokens for the user who initiated the flow, without verifying that the browser hitting the redire...

GHSA-XG2Q-62G2-CVCM Tinyauth's OIDC authorization codes are not bound to client on token exchange

Summary The OIDC token endpoint does not verify that the client exchanging an authorization code is the same client the code was issued to. A malicious OIDC client operator can exchange another client's authorization code using their own client credentials, obtaining tokens for users who never...

EUVD-2026-11671

@backstage/plugin-auth-backend: OAuth redirect URI allowlist bypass...

CVE-2026-29792

Feathersjs (v5.0.0–5.0.41) is vulnerable to an unauthenticated bypass in the OAuth callback endpoint. A forged profile sent via the query string to /oauth/:provider/callback can trigger a fallback path that reads params.query when Grant’s session/state is empty, allowing an attacker to drive enti...

CVE-2026-0953

The Tutor LMS Pro plugin for WordPress is vulnerable to authentication bypass in all versions up to, and including, 3.9.5 via the Social Login addon. This is due to the plugin failing to verify that the email provided in the authentication request matches the email from the validated OAuth token...

GHSA-9H33-G3WW-MQFF Pocket ID: OAuth redirect_uri validation bypass via userinfo/host confusion

Impact A flaw in callback URL validation allowed crafted redirecturi values containing URL userinfo @ to bypass legitimate callback pattern checks. If an attacker can trick a user into opening a malicious authorization link, the authorization code may be redirected to an attacker-controlled host...

CVE-2026-28477

OpenClaw versions prior to 2026.2.14 contain an oauth state validation bypass vulnerability in the manual Chutes login flow that allows attackers to bypass CSRF protection. An attacker can convince a user to paste attacker-controlled OAuth callback data, enabling credential substitution and token...

CVE-2026-28477

CVE-2026-28477 affects OpenClaw. The vulnerability is an OAuth state validation bypass in the manual Chutes login flow, enabling an attacker to substitute credentials and persist tokens for unauthorized accounts by tricking a user into pasting attacker-controlled OAuth callback data. Impact is cr...

CVE-2026-28477 OpenClaw < 2026.2.14 - OAuth State Validation Bypass in Manual Chutes Login Flow

OpenClaw versions prior to 2026.2.14 contain an oauth state validation bypass vulnerability in the manual Chutes login flow that allows attackers to bypass CSRF protection. An attacker can convince a user to paste attacker-controlled OAuth callback data, enabling credential substitution and token...