Authentication Bypass by Capture-replay in OpenClaw - CVE-2026-41351
Published: April 30, 2026
Vulnerability identifier: #VU128605
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-41351
CWE-ID: CWE-294
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: OpenClaw
Affected software:
OpenClaw
OpenClaw
Detailed vulnerability description
The vulnerability allows a remote user to bypass replay detection.
The vulnerability exists due to authentication bypass by capture-replay in the Telnyx webhook replay detection logic when processing Telnyx webhook signatures re-encoded between Base64 and Base64URL forms. A remote user can resend a captured webhook with a re-encoded signature to bypass replay detection.
Signature verification still holds, and the issue is limited to replay detection treating equivalent signature encodings as distinct requests.
How to mitigate CVE-2026-41351
Install security update from vendor's website.