Is CVE-2026-45399 actively exploited?

No active exploitation of CVE-2026-45399 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-45399 be exploited remotely?

Yes. CVE-2026-45399 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-45399?

CVE-2026-45399 has a CVSS score of 7.1 (HIGH).

HOME VULNERABILITIESCVE-2026-45399

HIGH

CVE-2026-45399

CWE-862Published: May 15, 2026· Updated: May 19, 2026

7.1

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:11.6th

Official Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, any authenticated user with low privileges can enumerate active background tasks across the system and stop tasks belonging to other users via the GET /api/tasks and POST /api/tasks/stop/{task_id} methods. This allows a casual user to disrupt system-wide chat usage by continuously canceling other users' active tasks. This is a real authorization vulnerability affecting integrity and usability in multi-user deployments. This vulnerability is fixed in 0.9.0.

NVD Source

Technical Analysis

CVE-2026-45399 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.1.