Vulnerability · Published Apr 3, 2026 · Assigned by VulnCheck
CVE-2026-34511OpenClaw < 2026.4.2 - PKCE Verifier Exposure via OAuth State Parameter
Medium 5.3
In plain English
A medium-severity weak randomness in OpenClaw from OpenClaw. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.2%top 83.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | openclaw | 2026.4.2 | GHSA-9jpj-g8vv-j5mf |
Affected products (as reported)
Weakness: CWE-330 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
References
- GitHub Security Advisory (GHSA-9jpj-g8vv-j5mf) vendor-advisory
- Patch Commit patch
- https://www.vulncheck.com/advisories/openclaw-pkce-verifier-exposure-via-oauth-state-parameter third-party-advisory