CVE-2026-53839 OpenClaw < 2026.5.7 - Hostname Prefix Matching Bypass in Trusted Retry Endpoint Validation
Attackers can bypass hostname validation to send authentication material to untrusted endpoints by exploiting prefix matching logic.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-53839?
CVE-2026-53839 is a medium-severity vulnerability in Openclaw Openclaw, published on 12 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-1023
Which versions are affected by CVE-2026-53839?
2 open source packages ship an affected version, including openclaw. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
openclaw npm | All versions | 2026.5.7 |
openclaw npm | All versions | 2026.5.7 |
Products include Openclaw Openclaw.
How do I fix CVE-2026-53839?
Upgrade openclaw to 2026.5.7 or later.
Is CVE-2026-53839 being exploited?
There is no known exploitation of CVE-2026-53839 in the wild and no public exploit code.
Other vulnerabilities in Openclaw Openclaw
- CVE-2026-28363 Security feature bypass in OpenClaw
- CVE-2026-30741 Code injection in n/a
- CVE-2026-33579 OpenClaw < 2026.3.28 - Privilege Escalation via Missing Caller Scope Validation in Device Pair Approval
- CVE-2026-32922 OpenClaw < 2026.3.11 - Privilege Escalation via Unvalidated Scope in device.token.rotate
- CVE-2026-32978 OpenClaw < 2026.3.11 - Approval Bypass via Unrecognized Script Runners
Sources
Also known as GHSA-77q5-rr5v-x43q, GHSA-wcpv-6hg7-mfcc, MINI-gvc7-gggg-rw62, MINI-mjf2-7vg3-x42h.