What’s Vulnerable › Vulnerabilities

CVE-2026-34511: OpenClaw < 2026.4.2 - PKCE Verifier Exposure via OAuth State Parameter

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-03 · updated 2026-07-24
• Weakness: CWE-330

Description

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.

Affected products

• OpenClaw: before 2026.4.2 — fixed in 2026.4.2

How to fix

Upgrade to a fixed version: OpenClaw 2026.4.2. Check the vendor advisory for mitigations.

References

• https://github.com/openclaw/openclaw/commit/a26f4d0f3ef0757db6c6c40277cc06a5de76c52f
• https://github.com/openclaw/openclaw/security/advisories/GHSA-9jpj-g8vv-j5mf
• https://www.vulncheck.com/advisories/openclaw-pkce-verifier-exposure-via-oauth-state-parameter

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