Auth bypass in Openbmb Xagent
CVE-2026-4959
A vulnerability was found in OpenBMB XAgent 1.0.0. This impacts the function check_user of the file XAgentServer/application/websockets/share.py of the component ShareServer WebSocket Endpoint. Performing a manipulation of the argument int…
Vulnerability class: Broken Authentication
EPSS: 0.002 (45.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.
Affected products
- Openbmb Xagent — versions 1.0.0
Weakness classification (CWE)
References
- VDB-353836 | OpenBMB XAgent ShareServer WebSocket Endpoint share.py check_user missing authentication (Permissions Required, technical-description, VDB Entry, vdb-entry)
- VDB-353836 | CTI Indicators (IOB, IOC, IOA) (signature, Permissions Required, permissions-required, VDB Entry)
- Submit #777622 | OpenBMB XAgent v1.0.0 CWE-306 (Third Party Advisory, Issue Tracking, third-party-advisory)
- cna@vuldb.com (Exploit, Third Party Advisory, exploit)
Frequently asked questions
- What is CVE-2026-4959?
- CVE-2026-4959 is a high-severity vulnerability in Openbmb Xagent, classified under Improper Authentication. CVSS score: 7.3/10. Published 2026-03-27.
- How severe is CVE-2026-4959?
- High severity. CVSS v3 base score is 7.3 out of 10.