Is CVE-2026-4959 actively exploited?

No active exploitation of CVE-2026-4959 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-4959 be exploited remotely?

Yes. CVE-2026-4959 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-4959?

CVE-2026-4959 has a CVSS score of 7.3 (HIGH).

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HIGH

CVE-2026-4959

CWE-287Published: March 27, 2026· Updated: Mar 30, 2026

7.3

CVSS v3.1

EPSS:0.06%probability of exploitation in 30 daysPercentile:19.2th

Official Description

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 interaction_id results in missing authentication. Remote exploitation of the attack is possible. The exploit has been made public and could be used. The vendor was contacted early about this disclosure but did not respond in any way.

NVD Source

Technical Analysis

CVE-2026-4959 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

From a weakness classification perspective (CWE-287): Authentication bypass vulnerabilities allow attackers to access protected resources without valid credentials.