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.
| Vendor | Product | Versions |
|---|---|---|
| openclaw | openclaw | 0, 2026.4.1 |
Updated affected versions to include 2026.4.1, changed severity to HIGH, added CWE-331, and noted no exploit available.
Initial creation
