CVE-2026-40037
Received Received - Intake
Request Body Replay Vulnerability in OpenClaw fetchWithSsrFGuard

Publication date: 2026-04-08

Last updated on: 2026-04-13

Assigner: VulnCheck

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.
CVSS Scores
EPSS Scores
Probability:
Percentile:
Meta Information
Published
2026-04-08
Last Modified
2026-04-13
Generated
2026-06-16
AI Q&A
2026-04-09
EPSS Evaluated
2026-06-15
NVD
CVE-2026-40037
EUVD
EUVD-2026-20781
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
openclaw openclaw to 2026.4.8 (exc)
Helpful Resources
Exploitability
CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-601 The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.
Attack-Flow Graph
AI Quick Actions
Instant insights powered by AI
Impact Analysis

The vulnerability can lead to the exposure of sensitive request data or headers to unauthorized third parties through cross-origin redirects. This can result in data leakage, potentially compromising user privacy or security by allowing attackers to exfiltrate confidential information.

Executive Summary

This vulnerability exists in OpenClaw versions before 2026.3.31 and involves a flaw in the fetchWithSsrFGuard function. It allows unsafe request bodies to be resent during cross-origin redirects. Attackers can exploit this behavior by triggering redirects that cause sensitive request data or headers to be sent to unintended external origins.

Compliance Impact

The vulnerability in OpenClaw allows unsafe request bodies to be resent across cross-origin redirects, which can lead to the exfiltration of sensitive request data or headers to unintended origins.

This behavior could potentially impact compliance with data protection regulations such as GDPR or HIPAA, as it risks unauthorized disclosure of sensitive personal or health information.

However, specific details on compliance impact or mitigation measures are not provided in the available information.

Chat Assistant
Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-40037. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70
EPSS Chart