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VulnerabilityPublished

CVE-2026-41351: OpenClaw · Authentication Bypass by Capture-replay

Affects OpenClawSource GCVE Database

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Not known to be exploited · CVSS 6.3 Medium : upgrade to 2026.3.31 when convenient.

Data as of 12 Nov 2026, 01:17 UTC

CVSS 4.0 base score
6.3Medium
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (VulnCheck)CVSS 4.06.3
CNA (VulnCheck)CVSS 3.15.3
Patch
Available – fixed in 2026.3.31
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

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 23 Apr 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 11 Nov 2026.

What to do

Upgrade OpenClaw to 2026.3.31.

Affected software

ProductAffectedFixed in
OpenClaw OpenClawAffected
  • <2026.3.31
Fixed in
  • 2026.3.31

AI-suggested

A fix is available in OpenClaw version 2026.3.31 and later. Users should upgrade to this version or later to address the replay detection bypass vulnerability. No other mitigation steps are indicated by the vendor advisory.

Description

OpenClaw versions before 2026.3.31 have a replay detection bypass vulnerability in webhook signature handling. The vulnerability arises because the system treats Base64 and Base64URL encoded signatures as distinct, allowing attackers to re-encode valid Telnyx webhook signatures to bypass replay detection while still passing signature verification.

References

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