How severe is CVE-2026-42421?

CVE-2026-42421 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-42421 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-42421?

CVE-2026-42421 affects Openclaw. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-42421?

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

Does CVE-2026-42421 have an EU (EUVD) identifier?

Yes. CVE-2026-42421 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-26124.

When was CVE-2026-42421 published?

CVE-2026-42421 was published on 2026-04-28 and last updated on 2026-06-17.

CVE-2026-42421

CVE-2026-42421 is a medium-severity vulnerability in Openclaw with a CVSS 3.x base score of 5.4. 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-613.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v4: 2.3
EPSS exploit prediction: 0% (8th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-26124
Weakness: CWE-613
Affected product: Openclaw
Published: 2026-04-28
Last modified: 2026-06-17

Description

OpenClaw before 2026.4.8 contains a session management vulnerability where existing WebSocket sessions survive shared gateway token rotation. Attackers can maintain unauthorized access to WebSocket connections after token rotation by exploiting the failure to disconnect existing shared-token sessions.

Frequently asked questions

What is CVE-2026-42421?: OpenClaw before 2026.4.8 contains a session management vulnerability where existing WebSocket sessions survive shared gateway token rotation. Attackers can maintain unauthorized access to WebSocket connections after token rotation by exploiting the failure to disconnect existing shared-token sessions.
How severe is CVE-2026-42421?: CVE-2026-42421 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-42421 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-42421?: CVE-2026-42421 affects Openclaw. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-42421?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-42421 have an EU (EUVD) identifier?: Yes. CVE-2026-42421 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-26124.
When was CVE-2026-42421 published?: CVE-2026-42421 was published on 2026-04-28 and last updated on 2026-06-17.

References

Affected products (1)

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

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