How severe is CVE-2026-53859?

CVE-2026-53859 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-53859 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-53859?

CVE-2026-53859 primarily affects Openclaw. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-53859?

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

Does CVE-2026-53859 have an EU (EUVD) identifier?

Yes. CVE-2026-53859 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-37161.

When was CVE-2026-53859 published?

CVE-2026-53859 was published on 2026-06-16 and last updated on 2026-06-17.

CVE-2026-53859

CVE-2026-53859 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-918.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v4: 6.0
EPSS exploit prediction: 0% (11th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-37161
Weakness: CWE-918
Affected product: Openclaw
Published: 2026-06-16
Last modified: 2026-06-17

Description

OpenClaw before 2026.5.26 contains a hostname validation vulnerability allowing attackers to bypass blocklist comparisons using trailing-dot notation in model or workspace-derived URLs. Attackers can exploit inconsistent hostname checks to reach destinations that operators intended to block through hostname policies.

Frequently asked questions

What is CVE-2026-53859?: OpenClaw before 2026.5.26 contains a hostname validation vulnerability allowing attackers to bypass blocklist comparisons using trailing-dot notation in model or workspace-derived URLs. Attackers can exploit inconsistent hostname checks to reach destinations that operators intended to block through hostname policies.
How severe is CVE-2026-53859?: CVE-2026-53859 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-53859 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-53859?: CVE-2026-53859 primarily affects Openclaw. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-53859?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-53859 have an EU (EUVD) identifier?: Yes. CVE-2026-53859 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-37161.
When was CVE-2026-53859 published?: CVE-2026-53859 was published on 2026-06-16 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:openclaw:openclaw:*:*:*:*:*:node.js:*:*
cpe:2.3:a:openclaw:openclaw:2026.5.26:beta1:*:*:*:node.js:*:*
cpe:2.3:a:openclaw:openclaw:2026.5.26:beta2:*:*:*:node.js:*:*

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