CVE-2026-41351

MEDIUM

OpenClaw < 2026.3.31 - Webhook Replay Detection Bypass via Base64 Signature Re-encoding

Title source: cna

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.

References (3)

[Vendor Advisory] https://github.com/openclaw/openclaw/security/advisories/GHSA-37v6-fxx8-xjmx

[Patch] https://github.com/openclaw/openclaw/commit/ad77666054651c1fd77b1dc60fd6a8db6600a29a

View Patch ZIP pw:eip

[Third Party Advisory] https://www.vulncheck.com/advisories/openclaw-webhook-replay-detection-bypass-via-base64-signature-re-encoding

Scores

CVSS v3 5.3

EPSS 0.0003

EPSS Percentile 7.9%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Details

CWE

CWE-294

Status published

Products (2)

OpenClaw/OpenClaw < 2026.3.31

OpenClaw/OpenClaw 2026.3.31

Published Apr 23, 2026

Tracked Since Apr 24, 2026