How severe is CVE-2026-53839?

CVE-2026-53839 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-2026-53839 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-53839?

CVE-2026-53839 affects Openclaw. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-53839?

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

Does CVE-2026-53839 have an EU (EUVD) identifier?

Yes. CVE-2026-53839 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36627.

When was CVE-2026-53839 published?

CVE-2026-53839 was published on 2026-06-12 and last updated on 2026-06-17.

CVE-2026-53839

CVE-2026-53839 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-1023.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v4: 6.0
EPSS exploit prediction: 0% (18th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-36627
Weakness: CWE-1023
Affected product: Openclaw
Published: 2026-06-12
Last modified: 2026-06-17

Description

OpenClaw before 2026.5.7 contains a hostname validation vulnerability in retry endpoint checks that allows matching hostname prefixes instead of exact hostnames. Attackers can exploit this by crafting a hostname prefix resembling a trusted host to send authentication material to untrusted endpoints.

Frequently asked questions

What is CVE-2026-53839?: OpenClaw before 2026.5.7 contains a hostname validation vulnerability in retry endpoint checks that allows matching hostname prefixes instead of exact hostnames. Attackers can exploit this by crafting a hostname prefix resembling a trusted host to send authentication material to untrusted endpoints.
How severe is CVE-2026-53839?: CVE-2026-53839 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-2026-53839 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-53839?: CVE-2026-53839 affects Openclaw. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-53839?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-53839 have an EU (EUVD) identifier?: Yes. CVE-2026-53839 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36627.
When was CVE-2026-53839 published?: CVE-2026-53839 was published on 2026-06-12 and last updated on 2026-06-17.

References

Affected products (1)

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

More vulnerabilities in Openclaw

CVE-2026-41329 — Critical (CVSS 9.9): OpenClaw before 2026.3.31 contains a sandbox bypass vulnerability allowing attackers to escalate privileges via…
CVE-2026-33579 — Critical (CVSS 9.9): OpenClaw before 2026.3.28 contains a privilege escalation vulnerability in the /pair approve command path that fails to…
CVE-2026-32922 — Critical (CVSS 9.9): OpenClaw before 2026.3.11 contains a privilege escalation vulnerability in device.token.rotate that allows callers with…
CVE-2026-22172 — Critical (CVSS 9.9): OpenClaw versions prior to 2026.3.12 contain an authorization bypass vulnerability in the WebSocket connect path that…
CVE-2026-28466 — Critical (CVSS 9.9): OpenClaw versions prior to 2026.2.14 contain a vulnerability in the gateway in which it fails to sanitize internal…
CVE-2026-28363 — Critical (CVSS 9.9): In OpenClaw before 2026.2.23, tools.exec.safeBins validation for sort could be bypassed via GNU long-option…

All CVEs affecting Openclaw →

Other CWE-1023 vulnerabilities

CVE-2026-4599 — Critical (CVSS 9.1): Versions of the package jsrsasign from 7.0.0 and before 11.1.1 are vulnerable to Incomplete Comparison with Missing…
CVE-2025-62000 — High (CVSS 7.1): BullWall Ransomware Containment may not always detect an encrypted file. This issue affects a specific file inspection…
CVE-2025-55333 — Medium (CVSS 6.1): Incomplete comparison with missing factors in Windows BitLocker allows an unauthorized attacker to bypass a security…
CVE-2026-7473 — Medium (CVSS 5.8): On affected platforms running Arista EOS where a tunnel decapsulation configuration—such as VXLAN (Virtual Extensible…
CVE-2025-46722 — Medium (CVSS 4.2): vLLM is an inference and serving engine for large language models (LLMs). In versions starting from 0.7.0 to before…
CVE-2026-48587 — Low (CVSS 3.1): An issue was discovered in Django 5.2 before 5.2.15 and 6.0 before 6.0.6. `django.utils.cache.has_vary_header()` in…

Browse all CWE-1023 vulnerabilities →