Vulnerability in Openclaw
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (34.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 34.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.002
Affected products
- Openclaw — versions 0, 2026.4.2
Weakness classification (CWE)
References
- GitHub Security Advisory (GHSA-9jpj-g8vv-j5mf) (vendor-advisory, Vendor Advisory)
- Patch Commit (Patch, patch)
- www.vulncheck.com/advisories/openclaw-pkce-verifier-exposure-via-oauth-state-pa… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-34511?
- CVE-2026-34511 is a medium-severity vulnerability in Openclaw, classified under Use of Insufficiently Random Values. CVSS score: 5.3/10. Published 2026-04-03.
- How severe is CVE-2026-34511?
- Medium severity. CVSS v3 base score is 5.3 out of 10.