CVE-2026-47386

NocoDB is software for building databases as spreadsheets. Prior to 2026.05.1, two concurrent token-exchange requests using the same OAuth authorization code could each mint a distinct valid accesstoken, refreshtoken pair, breaking the single-use guarantee that PKCE relies on. This vulnerability ...

@node-oauth/oauth2-server: PKCE code_verifier ABNF not enforced in token exchange allows brute-force redemption of intercepted authorization codes

Summary The token exchange path accepts RFC7636-invalid codeverifier values including one-character strings for S256 PKCE flows. Because short/weak verifiers are accepted and failed verifier attempts do not consume the authorization code, an attacker who intercepts an authorization code can...

EUVD-2026-18849

OpenClaw before 2026.4.2 reuses the PKCE verifier as the OAuth state parameter in the Gemini OAuth flow, exposing it through the redirect URL. Attackers who capture the redirect URL can obtain both the authorization code and PKCE verifier, defeating PKCE protection and enabling token redemption...

authentik Authorization Issues Vulnerability

authentik is an open source identity provisioning application from authentik Open Source. An authorization issue vulnerability exists in Authentik versions prior to 2023.8.7 and 2023.10.7, which stems from a security issue in authentik's PKCE that allows an attacker to bypass the protections...

PT-2023-31620 · Unknown · Yii2-Authclient

Name of the Vulnerable Software and Affected Versions: yii2-authclient versions prior to 2.2.15 Description: The Oauth2 PKCE implementation in yii2-authclient is vulnerable in two ways. First, the authCodeVerifier should be removed after usage, similar to authState. Second, there is a risk for a...

GHSA-2FW4-MGQ9-39CX Code Injection in oauth2-server

"oauth2-server aka node-oauth2-server through 3.1.1 implements OAuth 2.0 without PKCE. It does not prevent authorization code injection. This is similar to CVE-2020-7692. NOTE: the vendor states 'As RFC7636 is an extension, I think the claim in the Readme of "RFC 6749 compliant" is valid and not...