CVE-2026-53839 | OpenClaw before 2026.5.7 contains a hostname validation vuln… | CVSS 6.5 MEDIUM

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.

Metadata

CVE ID: CVE-2026-53839
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-06-10 21:19 UTC
Published: 2026-06-12 21:57 UTC
Last updated: 2026-06-12 21:57 UTC
Primary CWE: CWE-1023
Incomplete Comparison with Missing Factors
Vendor / Product: OpenClaw / OpenClaw
Sources: cve.org · NVD

Severity & Metrics

6.5 MEDIUM CVSS 3.1

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

Affected products (1)

Vendor	Product	Platform	Versions
OpenClaw	OpenClaw	—	0 < 2026.5.7, 2026.5.7

Weakness (CWE)

CWE	Source	Description
CWE-1023	cna	Incomplete Comparison with Missing Factors

CVSS scores (2)

Score	Severity	Version	Source	Vector
6.5	MEDIUM	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
6.0	MEDIUM	4.0	cna	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

References (2)

GitHub Security Advisory (GHSA-77q5-rr5v-x43q) https://github.com/openclaw/openclaw/security/advisories/GHSA-77q5-rr5v-x43q
VulnCheck Advisory: OpenClaw < 2026.5.7 - Hostname Prefix Matching Bypass in Trusted Retry Endpoint Validation https://www.vulncheck.com/advisories/openclaw-hostname-prefix-matching-bypass-in-trusted-retry-endpoint-validation