OpenClaw: Gemini OAuth exposed the PKCE verifier through the OAuth state parameter
Summary
Before OpenClaw 2026.4.2, the Gemini OAuth flow reused the PKCE verifier as the OAuth state value. Because the provider reflected state back in the redirect URL, the verifier could be exposed alongside the authorization code.
Impact
Anyone who could capture the redirect URL could learn both the authorization code and the PKCE verifier, defeating PKCE's interception protection for that flow and enabling token redemption.
Affected Packages / Versions
- Package:
openclaw(npm) - Affected versions:
<= 2026.4.1 - Patched versions:
>= 2026.4.2 - Latest published npm version:
2026.4.1
Fix Commit(s)
a26f4d0f3ef0757db6c6c40277cc06a5de76c52f— separate OAuth state from the PKCE verifier
OpenClaw thanks @BG0ECV for reporting.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | openclaw | < 2026.4.2 | 2026.4.2 |
References
- https://github.com/openclaw/openclaw/security/advisories/GHSA-9jpj-g8vv-j5mf
- https://nvd.nist.gov/vuln/detail/CVE-2026-34511
- https://github.com/openclaw/openclaw/commit/a26f4d0f3ef0757db6c6c40277cc06a5de76c52f
- https://github.com/openclaw/openclaw
- https://www.vulncheck.com/advisories/openclaw-pkce-verifier-exposure-via-oauth-state-parameter
- CVSS vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:H/SI:H/SA:N- Weakness (CWE)
CWE-345- Platform
- npm
- Package
openclaw- Disclosed
- 04.04.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-9jpj-g8vv-j5mf - CC BY 4.0
Vulnerability history: openclaw
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 588
- First → latest
- 02.2026 07.2026
- Without a fix
- 9
- Exploited in attacks
- 0
Severity breakdown
- Critical 20
- High 215
- Medium 299
- Low 54
Disclosures per year
- 2026: 588
-
OpenClaw: Gemini OAuth exposed the PKCE verifier through the OAuth state parameter this entry
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