Vulnerability Details CVE-2026-34511
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 9.1%
CVSS Severity
CVSS v3 Score 5.3