| Component | OpenClaw |
| Severity | medium (CVSS 5.3) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
| Published (NVD) | 2026-04-23 |
| Last modified | 2026-06-17 |
| Affected versions | openclaw < 2026.3.31 |
| Fixed in | 2026.3.31 |
| Weakness | CWE-294 |
| CISA KEV | not listed |
NVD 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.
What to do
- Upgrade OpenClaw to
2026.3.31or later. - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2026-41351
- https://github.com/openclaw/openclaw/security/advisories/GHSA-37v6-fxx8-xjmx
- https://github.com/openclaw/openclaw/commit/ad77666054651c1fd77b1dc60fd6a8db6600a29a
- https://www.vulncheck.com/advisories/openclaw-webhook-replay-detection-bypass-via-base64-signature-re-encoding
Read more
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