Every CVE Search/ Get API key

CVE-2026-40037

OpenClaw < 2026.4.8 - Unsafe Request Body Replay via fetchWithSsrFGuard Cross-Origin Redirects

7.1 HighFix available

OpenClaw before 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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
Passive

What an attacker can affect

Confidentiality
High
Integrity
None
Availability
None

Exploit likelihood

0.32%Up 0.3 points since Apr 9, 2026
90%50%10%1%

What each source reports

CVE List Score used 7.1

OpenClaw < 2026.4.8 - Unsafe Request Body Replay via fetchWithSsrFGuard Cross-Origin Redirects

OpenClaw before 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.

Record
CVE-2026-40037
CVSS 4.0
7.1 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Weakness
CWE-601
Updated
2026-11-02
EUVDEUVD-2026-20781 7.1

OpenClaw before 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.

Record
EUVD-2026-20781
CVSS 4.0
7.1 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-pg8g-f2hf-x82m 7.1

Duplicate Advisory: OpenClaw: `fetchWithSsrFGuard` replays unsafe request bodies across cross-origin redirects

Duplicate Advisory

This advisory has been withdrawn because it is a duplicate of GHSA-qx8j-g322-qj6m. This link is maintained to preserve external references.

Original 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.

Record
GHSA-pg8g-f2hf-x82m
CVSS 4.0
7.1 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Weakness
CWE-601
Updated
2026-11-02
GitHub AdvisoriesGHSA-qx8j-g322-qj6m 7.4

OpenClaw: `fetchWithSsrFGuard` replays unsafe request bodies across cross-origin redirects

Impact

fetchWithSsrFGuard replays unsafe request bodies across cross-origin redirects.

A guarded fetch could resend unsafe request bodies or headers when following cross-origin redirects.

OpenClaw is a user-controlled local assistant. This advisory is scoped to the OpenClaw trust model and does not assume a multi-tenant service boundary.

Affected Packages / Versions

  • Package: openclaw (npm)
  • Affected versions: <2026.3.31
  • Patched versions: 2026.4.8

Fix

The issue was fixed on main and is available in the patched npm version listed above. The verified fixed tree is commit d7c3210cd6f5fdfdc1beff4c9541673e814354d5.

Verification

The fix was re-checked against main before publication, including targeted regression tests for the affected security boundary.

Credits

Thanks @BG0ECV for reporting.

Record
GHSA-qx8j-g322-qj6m
CVSS 4.0
7.4 HighCVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-345
Updated
2026-11-02
NVD 7.1

OpenClaw before 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.

Record
CVE-2026-40037
CVSS 4.0
7.1 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Weakness
CWE-601
Updated
2026-11-02
OSV 7.1

OpenClaw < 2026.4.8 - Unsafe Request Body Replay via fetchWithSsrFGuard Cross-Origin Redirects

OpenClaw before 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.

Record
CVE-2026-40037
CVSS 4.0
7.1 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-601
Updated
2026-11-02
OSVGHSA-pg8g-f2hf-x82m 7.1

Duplicate Advisory: OpenClaw: `fetchWithSsrFGuard` replays unsafe request bodies across cross-origin redirects

Duplicate Advisory

This advisory has been withdrawn because it is a duplicate of GHSA-qx8j-g322-qj6m. This link is maintained to preserve external references.

Original 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.

Record
GHSA-pg8g-f2hf-x82m
CVSS 4.0
7.1 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Weakness
CWE-601
Updated
2026-11-02
OSVGHSA-qx8j-g322-qj6m 7.4

OpenClaw: `fetchWithSsrFGuard` replays unsafe request bodies across cross-origin redirects

Impact

fetchWithSsrFGuard replays unsafe request bodies across cross-origin redirects.

A guarded fetch could resend unsafe request bodies or headers when following cross-origin redirects.

OpenClaw is a user-controlled local assistant. This advisory is scoped to the OpenClaw trust model and does not assume a multi-tenant service boundary.

Affected Packages / Versions

  • Package: openclaw (npm)
  • Affected versions: <2026.3.31
  • Patched versions: 2026.4.8

Fix

The issue was fixed on main and is available in the patched npm version listed above. The verified fixed tree is commit d7c3210cd6f5fdfdc1beff4c9541673e814354d5.

Verification

The fix was re-checked against main before publication, including targeted regression tests for the affected security boundary.

Credits

Thanks @BG0ECV for reporting.

Record
GHSA-qx8j-g322-qj6m
CVSS 4.0
7.4 HighCVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-345
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
openclaw
npm
 before 2026.4.8
2026.4.8

History

History
RecordedChangedSources
affected
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-40037 is a high vulnerability (CVSS 7.1) in Openclaw, published April 8, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.32%, the 24th percentile. Fixed in openclaw 2026.4.8.

References

Pages All vulnerabilities Browse Docs Sources Guide Get API key
MoveEnter Open