CVE-2026-46544 Information disclosure in UFO
An authenticated attacker can predict session IDs to retrieve stale task results from other users in the Microsoft UFO automation framework.
- 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-2026-46544?
CVE-2026-46544 is a medium-severity vulnerability in microsoft UFO, published on 27 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Microsoft UFO open-source framework for intelligent automation across devices and platforms. In 3.0.1-4-ge2626659, Microsoft UFO accepts client-supplied session_id values in WebSocket task messages and reuses an existing in-memory session object if that session_id already exists. If a prior session has completed and remains in memory with populated results, a different authenticated client can send a new TASK message using the same session_id. The server re-enters the existing session object and sends the stale stored result to the new requester through the normal send_task_end() callback path. This is an authenticated cross-client stale result replay issue. The issue requires that the attacker knows or can predict a live or recently completed session_id.
Weakness: CWE-639
Which versions are affected by CVE-2026-46544?
How do I fix CVE-2026-46544?
No fix has been published for CVE-2026-46544 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-46544 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-46544 exists.