CVE-2026-41351
OpenClaw < 2026.3.31 - Webhook Replay Detection Bypass via Base64 Signature Re-encoding
CVSS Score
5.3
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-294 |
| Vendor | openclaw |
| Product | openclaw |
| Published | Apr 23, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None
Affected Versions
OpenClaw / OpenClaw
0 < 2026.3.31
References
github.com: https://github.com/openclaw/openclaw/security/advisories/GHSA-37v6-fxx8-xjmx github.com: https://github.com/openclaw/openclaw/commit/ad77666054651c1fd77b1dc60fd6a8db6600a29a vulncheck.com: https://www.vulncheck.com/advisories/openclaw-webhook-replay-detection-bypass-via-base64-signature-re-encoding
Credits
🔍 AntAISecurityLab