OpenClaw before 2026.5.7 contains a hostname validation vulnerability in retry endpoint checks that allows matching hostname prefixes instead of exact hostnames.
Date: 2026-06
Affected: openclaw/openclaw
Attack vector: other
Category: vulnerability-disclosure
Severity: Medium
CVE: CVE-2026-53839
CWE: CWE-1023
CVSS: 6.5 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N)

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.


Mitigations:

Architectural layers (MAESTRO):