CVE-2026-53839

OpenClaw < 2026.5.7 - Hostname Prefix Matching Bypass in Trusted Retry Endpoint Validation

State: Published
Severity: 6.0 Medium
Published: Jun 12, 2026
Updated: Oct 8, 2026
Reserved: Jun 10, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	6.0 Medium	CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N	VulnCheck
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N	VulnCheck

Weaknesses

CWE-1023 Incomplete Comparison with Missing Factors

Affected Products

Product	Versions
OpenClawOpenClaw	before 2026.5.7Affected 2026.5.7Not affected

References

GitHub Security Advisory (GHSA-77q5-rr5v-x43q)vendor-advisory
VulnCheck Advisory: OpenClaw < 2026.5.7 - Hostname Prefix Matching Bypass in Trusted Retry Endpoint Validationthird-party-advisory

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