Python Social Auth: OpenID Connect nonce is not bound to the browser session, so a stolen authorization code logs the attacker in as the victim

影響: pip:social-auth-core <= 6.1.1 → 6.2.0

The generic OpenID Connect backend (OpenIdConnectAuth and every backend built on it) stores the nonce in the shared Association table, not in the user's session. When the ID token comes back, validate_claims only checks that the nonce exists in that table and is not expired. It does not check that the nonce was issued to the browser that is finishing the login. So the nonce does not do its job. OIDC Core (section 15.5.2) and RFC 9700 (section 4.5) use the nonce to stop authorization code inject…

GitHub Advisory Databaseで読む

2026/10/29 06:16、GitHub Advisory Databaseが「Python Social Auth: OpenID Connect nonce is not bound to the browser session, so a stolen authorization code logs the attacker in as the victim」を公開しました (種別: 脆弱性アドバイザリ)。重大度は「警告」(medium) です。関連する技術: Python。CVE: CVE-2026-115910。