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.

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…

EPSS: 0.000 (13.2th percentile) — read the EPSS interpretation.

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.

Affected products

Openclaw — versions 0, 2026.3.31

Weakness classification (CWE)

CWE-294 — Authentication Bypass by Capture-replay

References

GitHub Security Advisory (GHSA-37v6-fxx8-xjmx) (vendor-advisory, Vendor Advisory)
Patch Commit (Patch, patch)
VulnCheck Advisory: OpenClaw < 2026.3.31 - Webhook Replay Detection Bypass via Base64 Signature Re-encoding (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.