CVE-2026-41351CWE-294

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

Medium · published April 23, 2026

CVSS v4.0
6.3
EPSS
0%
Percentile
36.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
6.3 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
EPSS
0.00436 · 36.8th percentile
Weakness
CWE-294 · Authentication Bypass by Capture-replay
Published
2026-04-23T21:58Z
EPSS history
Timeline
  • 23 APR 21:58Z
    OpenClaw < 2026.3.31 - Webhook Replay Detection Bypass via Base64 Signature Re-encoding
    cvelistv5