CVE-2026-40037 | THREATINT

Description

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.

PUBLISHED Reserved 2026-04-08 | Published 2026-04-08 | Updated 2026-05-25 | Assigner VulnCheck

HIGH: 7.1CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

MEDIUM: 6.5CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Problem types

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

Product status

Default status

unaffected

Any version before 2026.4.8

affected

2026.4.8 (semver)

unaffected

Credits

RaaX (@BG0ECV) reporter

RaaX (@BG0ECV) finder

References

github.com/...enclaw/security/advisories/GHSA-qx8j-g322-qj6m (GitHub Security Advisory (GHSA-qx8j-g322-qj6m)) third-party-advisory

github.com/...ommit/d7c3210cd6f5fdfdc1beff4c9541673e814354d5 (Patch Commit) patch

www.vulncheck.com/...tchwithssrfguard-cross-origin-redirects (VulnCheck Advisory: OpenClaw < 2026.3.31 - Unsafe Request Body Replay via fetchWithSsrFGuard Cross-Origin Redirects) third-party-advisory

cve.org (CVE-2026-40037)

nvd.nist.gov (CVE-2026-40037)

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