CVE-2026-53839 — MEDIUM (6.5)

Q: How severe is CVE-2026-53839?

CVE-2026-53839 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2026-53839?

Check the references section above for vendor advisories and patch information. Affected products include: Openclaw Openclaw.

Vulnerability 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.

CVSS Score

6.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

NONE

Availability

NONE

Affected Products

Vendor	Product	Versions
Openclaw	Openclaw	< 2026.5.7

Related Weaknesses (CWE)

CWE-1023

References

https://github.com/openclaw/openclaw/security/advisories/GHSA-77q5-rr5v-x43qMitigationVendor Advisory
https://www.vulncheck.com/advisories/openclaw-hostname-prefix-matching-bypass-inThird Party Advisory

FAQ

What is CVE-2026-53839?

CVE-2026-53839 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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...

How severe is CVE-2026-53839?

CVE-2026-53839 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-53839?

Check the references section above for vendor advisories and patch information. Affected products include: Openclaw Openclaw.