How severe is CVE-2026-40037?

CVE-2026-40037 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-40037 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-40037?

CVE-2026-40037 affects Openclaw. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-40037?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-40037 have an EU (EUVD) identifier?

Yes. CVE-2026-40037 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20781.

When was CVE-2026-40037 published?

CVE-2026-40037 was published on 2026-04-08 and last updated on 2026-06-17.

CVE-2026-40037

CVE-2026-40037 is a medium-severity vulnerability in Openclaw with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-601.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v4: 7.1
EPSS exploit prediction: 0% (15th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-20781
Weakness: CWE-601
Affected product: Openclaw
Published: 2026-04-08
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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 redirects to exfiltrate sensitive request data or headers to unintended origins.
How severe is CVE-2026-40037?: CVE-2026-40037 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-40037 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-40037?: CVE-2026-40037 affects Openclaw. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-40037?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-40037 have an EU (EUVD) identifier?: Yes. CVE-2026-40037 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20781.
When was CVE-2026-40037 published?: CVE-2026-40037 was published on 2026-04-08 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:openclaw:openclaw:*:*:*:*:*:node.js:*:*

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