How severe is CVE-2026-53840?

CVE-2026-53840 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability none.

Is CVE-2026-53840 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-53840?

CVE-2026-53840 primarily affects Openclaw. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-53840?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-53840 have an EU (EUVD) identifier?

Yes. CVE-2026-53840 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-37142.

When was CVE-2026-53840 published?

CVE-2026-53840 was published on 2026-06-16 and last updated on 2026-06-17.

CVE-2026-53840

CVE-2026-53840 is a high-severity vulnerability in Openclaw with a CVSS 3.x base score of 7.1. 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-522.

Key facts

Severity: High (CVSS 3.x base score 7.1)
CVSS v4: 6.0
EPSS exploit prediction: 0% (13th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-37142
Weakness: CWE-522
Affected product: Openclaw
Published: 2026-06-16
Last modified: 2026-06-17

Description

OpenClaw before 2026.5.12 contains an information disclosure vulnerability in streamable-http MCP servers that forwards operator-configured custom headers during cross-origin redirects. Attackers controlling or compromising an MCP endpoint can redirect requests to exfiltrate sensitive headers like API keys or tenant-routing credentials to attacker-controlled origins.

Frequently asked questions

What is CVE-2026-53840?: OpenClaw before 2026.5.12 contains an information disclosure vulnerability in streamable-http MCP servers that forwards operator-configured custom headers during cross-origin redirects. Attackers controlling or compromising an MCP endpoint can redirect requests to exfiltrate sensitive headers like API keys or tenant-routing credentials to attacker-controlled origins.
How severe is CVE-2026-53840?: CVE-2026-53840 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability none.
Is CVE-2026-53840 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-53840?: CVE-2026-53840 primarily affects Openclaw. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-53840?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-53840 have an EU (EUVD) identifier?: Yes. CVE-2026-53840 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-37142.
When was CVE-2026-53840 published?: CVE-2026-53840 was published on 2026-06-16 and last updated on 2026-06-17.

References

Affected products (9)

cpe:2.3:a:openclaw:openclaw:*:*:*:*:*:node.js:*:*
cpe:2.3:a:openclaw:openclaw:2026.5.12:beta1:*:*:*:node.js:*:*
cpe:2.3:a:openclaw:openclaw:2026.5.12:beta2:*:*:*:node.js:*:*
cpe:2.3:a:openclaw:openclaw:2026.5.12:beta3:*:*:*:node.js:*:*
cpe:2.3:a:openclaw:openclaw:2026.5.12:beta4:*:*:*:node.js:*:*
cpe:2.3:a:openclaw:openclaw:2026.5.12:beta5:*:*:*:node.js:*:*
cpe:2.3:a:openclaw:openclaw:2026.5.12:beta6:*:*:*:node.js:*:*
cpe:2.3:a:openclaw:openclaw:2026.5.12:beta7:*:*:*:node.js:*:*
cpe:2.3:a:openclaw:openclaw:2026.5.12:beta8:*:*:*:node.js:*:*

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