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Description

OpenClaw versions prior to 2026.2.12 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 determine the authentication token.

PUBLISHED Reserved 2026-02-27 | Published 2026-03-05 | Updated 2026-03-09 | Assigner VulnCheck




HIGH: 8.2CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

MEDIUM: 5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Problem types

Observable Timing Discrepancy

Product status

Default status
unaffected

Any version before 2026.2.12
affected

Credits

AM (@akhmittra) reporter

References

github.com/...enclaw/security/advisories/GHSA-jmm5-fvh5-gf4p (GitHub Security Advisory (GHSA-jmm5-fvh5-gf4p)) vendor-advisory

github.com/...ommit/113ebfd6a23c4beb8a575d48f7482593254506ec (Patch Commit) patch

www.vulncheck.com/...ng-attack-in-hooks-token-authentication (VulnCheck Advisory: OpenClaw < 2026.2.12 - Timing Attack in Hooks Token Authentication) third-party-advisory

cve.org (CVE-2026-28464)

nvd.nist.gov (CVE-2026-28464)

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