EUVD-2026-18849
GHSA-ch86-pxr9-j9h9
CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
4Description
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.
Analysis
OpenClaw before version 2026.4.2 reuses the PKCE verifier as the OAuth state parameter in Gemini OAuth flows, exposing cryptographic material through the redirect URL and enabling attackers who capture the URL to obtain both the authorization code and PKCE verifier, defeating PKCE protection and allowing unauthorized token redemption. The vulnerability requires user interaction (redirect capture) but has high confidentiality impact affecting OAuth security mechanisms; it is an information disclosure flaw in the OAuth implementation itself rather than a remote code execution threat.
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