SSRF in Openclaw
CVE-2026-53859
OpenClaw before 2026.5.26 contains a hostname validation vulnerability allowing attackers to bypass blocklist comparisons using trailing-dot notation in model or workspace-derived URLs. Attackers can exploit inconsistent hostname checks to reach destinations that operators intended to block through hostname policies.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (27.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 27.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.002
Affected products
- Openclaw — versions 0, 2026.5.26
Weakness classification (CWE)
References
- github.com/openclaw/openclaw/security/advisories/GHSA-gxg4-2rrr-jhc7 (vendor-advisory, Mitigation, Vendor Advisory)
- www.vulncheck.com/advisories/openclaw-hostname-validation-bypass-via-trailing-d… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-53859?
- CVE-2026-53859 is a medium-severity vulnerability in Openclaw, classified under Server-Side Request Forgery (SSRF). CVSS score: 6.5/10. Published 2026-06-16.
- How severe is CVE-2026-53859?
- Medium severity. CVSS v3 base score is 6.5 out of 10.