OpenClaw versions prior to 2026.2.13 use non-constant-time string comparison for hook token validation, allowing attackers to infer tokens through timing measurements. Remote attackers with network access to the hooks endpoint can exploit timing side-channels across multiple requests to gradually recover the authentication token.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
High
Difficult to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
Low
Partial data leak
Integrity
Low
Partial data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
References 3
https://github.com/openclaw/openclaw/commit/113ebfd6a23c4beb8a575d48f7482593254…
disclosure@vulncheck.com
https://github.com/openclaw/openclaw/security/advisories/GHSA-47q7-97xp-m272
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/openclaw-timing-attack-via-hook-token-comp…
disclosure@vulncheck.com