CVE-2026-41351 | THREATINT

Description

OpenClaw before 2026.3.31 contains a replay detection bypass vulnerability in webhook signature handling that treats Base64 and Base64URL encoded signatures as distinct requests. Attackers can re-encode Telnyx webhook signatures to bypass replay detection while maintaining valid signature verification.

PUBLISHED Reserved 2026-04-20 | Published 2026-04-23 | Updated 2026-04-24 | Assigner VulnCheck

MEDIUM: 6.3CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

MEDIUM: 5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Problem types

CWE-294 Authentication Bypass by Capture-replay

Product status

Default status

unaffected

Any version before 2026.3.31

affected

2026.3.31 (semver)

unaffected

Credits

AntAISecurityLab reporter

References

github.com/...enclaw/security/advisories/GHSA-37v6-fxx8-xjmx (GitHub Security Advisory (GHSA-37v6-fxx8-xjmx)) vendor-advisory

github.com/...ommit/ad77666054651c1fd77b1dc60fd6a8db6600a29a (Patch Commit) patch

www.vulncheck.com/...bypass-via-base64-signature-re-encoding (VulnCheck Advisory: OpenClaw < 2026.3.31 - Webhook Replay Detection Bypass via Base64 Signature Re-encoding) third-party-advisory

cve.org (CVE-2026-41351)

nvd.nist.gov (CVE-2026-41351)

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