Open Redirect in Openclaw
CVE-2026-40037
OpenClaw before 2026.3.31 (patched in 2026.4.8) contains a request body replay vulnerability in fetchWithSsrFGuard that allows unsafe request bodies to be resent across cross-origin redirects. Attackers can exploit this by triggering redirects to exfiltrate sensitive request data or headers to unintended origins.
Vulnerability class: Open Redirect
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.005 (43.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 43.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002
Affected products
- Openclaw — versions 0, 2026.4.8
Weakness classification (CWE)
References
- GitHub Security Advisory (GHSA-qx8j-g322-qj6m) (vendor-advisory, third-party-advisory, Vendor Advisory)
- Patch Commit (Patch, patch)
- VulnCheck Advisory: OpenClaw < 2026.3.31 - Unsafe Request Body Replay via fetchWithSsrFGuard Cross-Origin Redirects (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-40037?
- CVE-2026-40037 is a medium-severity vulnerability in Openclaw, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.5/10. Published 2026-04-08.
- How severe is CVE-2026-40037?
- Medium severity. CVSS v3 base score is 6.5 out of 10.