CVE-2026-4958 OpenBMB XAgent WebSocket Endpoint replayer.py ReplayServer.send_data authorization

Low 2.3 Published 27 Mar 2026 Updated 30 Mar 2026

Attackers can bypass authorization in the XAgent WebSocket endpoint by manipulating interaction_id, potentially accessing restricted replay data.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-4958?

CVE-2026-4958 is a low-severity missing authorization vulnerability in OpenBMB XAgent, published on 27 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A vulnerability has been found in OpenBMB XAgent 1.0.0. This affects the function ReplayServer.on_connect/ReplayServer.send_data of the file XAgentServer/application/websockets/replayer.py of the component WebSocket Endpoint. Such manipulation of the argument interaction_id leads to authorization bypass. The attack may be launched remotely. Attacks of this nature are highly complex. The exploitability is reported as difficult. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-639, CWE-285

Which versions are affected by CVE-2026-4958?

It affects 1 product.

Products include Openbmb Xagent.

How do I fix CVE-2026-4958?

No fix has been published for CVE-2026-4958 yet. Limit exposure of the affected software until one is available.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2026-4958 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4958 exists.

Sources

Also known as GHSA-pj48-vv9m-5qqf.