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.

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 redir…

Vulnerability class: Open Redirect

EPSS: 0.000 (11.4th percentile) — read the EPSS interpretation.

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.

Affected products

Openclaw — versions 0, 2026.4.8

Weakness classification (CWE)

CWE-601 — URL Redirection to Untrusted Site (Open Redirect)

References

GitHub Security Advisory (GHSA-qx8j-g322-qj6m) (third-party-advisory)
Patch Commit (patch)
VulnCheck Advisory: OpenClaw < 2026.3.31 - Unsafe Request Body Replay via fetchWithSsrFGuard Cross-Origin Redirects (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.