Vulnerability in Openclaw
CVE-2026-41351
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 · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (35.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 35.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
- Openclaw — versions 0, 2026.3.31
Weakness classification (CWE)
References
- github.com/openclaw/openclaw/security/advisories/GHSA-37v6-fxx8-xjmx (vendor-advisory, Vendor Advisory)
- github.com/openclaw/openclaw/commit/ad77666054651c1fd77b1dc60fd6a8db6600a29a (Patch, patch)
- www.vulncheck.com/advisories/openclaw-webhook-replay-detection-bypass-via-base6… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-41351?
- CVE-2026-41351 is a medium-severity vulnerability in Openclaw, classified under Authentication Bypass by Capture-replay. CVSS score: 5.3/10. Published 2026-04-23.
- How severe is CVE-2026-41351?
- Medium severity. CVSS v3 base score is 5.3 out of 10.