Medium severity · published Apr 3, 2026
CVE-2026-34511
OpenClaw < 2026.4.2 - PKCE Verifier Exposure via OAuth State Parameter
5.9
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 15% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
OpenClaw · OpenClaw
before 2026.4.2 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-34511
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-34511
Patch
https://github.com/openclaw/openclaw/commit/a26f4d0f3ef0757db6c6c40277cc06a5de76c52f
Vendor Advisory
https://github.com/openclaw/openclaw/security/advisories/GHSA-9jpj-g8vv-j5mf
Third Party Advisory
https://www.vulncheck.com/advisories/openclaw-pkce-verifier-exposure-via-oauth-state-parameter
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