Sensitive data disclosure via cross-origin request replay
Published Apr 8, 2026 · Updated Apr 8, 2026
Request body replay in OpenClaw before 2026.3.31 allows attackers to disclose sensitive request data through cross-origin redirects. The fetchWithSsrFGuard routine follows a redirect to a different origin and resends unsafe request bodies or headers instead of suppressing them. Exploitation requires an attacker-controlled redirect and user interaction; the demonstrated consequence is disclosure to the unintended origin.
Summary
What happened
Request body replay in OpenClaw before 2026.3.31 allows attackers to disclose sensitive request data through cross-origin redirects. The fetchWithSsrFGuard routine follows a redirect to a different origin and resends unsafe request bodies or headers instead of suppressing them. Exploitation requires an attacker-controlled redirect and user interaction; the demonstrated consequence is disclosure to the unintended origin.
The record
- CVE
- CVE-2026-40037
- Published
- Apr 8, 2026
- Updated
- Apr 8, 2026
- Vendor
- OpenClaw Foundation
- Product
- OpenClaw
- Classifications
- CWE-601
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 8, 2026CVE publishedPublication date reported by the CVE source.
- Apr 8, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=0 <2026.3.31
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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