CVE-2026-41351: OpenClaw · Authentication Bypass by Capture-replay
Affects OpenClawSource GCVE Database
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
Thin evidence
One scorer or none| CNA (VulnCheck) | CVSS 4.0 | 6.3 |
|---|---|---|
| CNA (VulnCheck) | CVSS 3.1 | 5.3 |
- 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:NExploitation evidence
Disclosed: evidence found.
CVE published 23 Apr 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
| Product | Affected | Fixed in |
|---|---|---|
| OpenClaw OpenClaw | Affected
| Fixed in
|
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
- github.com/openclaw/openclaw/security/advisories/GHSA-37v6-fxx8-xjmx (opens in a new tab)
- github.com/openclaw/openclaw/commit/ad77666054651c1fd77b1dc60fd6a8db6600a29a (opens in a new tab)
- vulncheck.com/advisories/openclaw-webhook-replay-detection-bypass-via-base64-signature-re-encoding (opens in a new tab)