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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.

PUBLISHED Reserved 2026-06-10 | Published 2026-06-12 | Updated 2026-06-15 | Assigner VulnCheck




MEDIUM: 6.0CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

MEDIUM: 6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Problem types

Incomplete Comparison with Missing Factors

Product status

Default status
unaffected

Any version before 2026.5.7
affected

2026.5.7 (semver)
unaffected

Credits

ccy41928-del reporter

References

github.com/...enclaw/security/advisories/GHSA-77q5-rr5v-x43q (GitHub Security Advisory (GHSA-77q5-rr5v-x43q)) vendor-advisory

www.vulncheck.com/...ss-in-trusted-retry-endpoint-validation (VulnCheck Advisory: OpenClaw < 2026.5.7 - Hostname Prefix Matching Bypass in Trusted Retry Endpoint Validation) third-party-advisory

cve.org (CVE-2026-53839)

nvd.nist.gov (CVE-2026-53839)

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