Is CVE-2026-44556 actively exploited?

No active exploitation of CVE-2026-44556 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-44556 be exploited remotely?

Yes. CVE-2026-44556 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-44556?

CVE-2026-44556 has a CVSS score of 7.1 (HIGH).

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HIGH

CVE-2026-44556

CWE-284Published: May 15, 2026· Updated: May 19, 2026

7.1

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:11.0th

Official Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, the /responses endpoint in the OpenAI router accepts any authenticated user and forwards requests directly to upstream LLM providers without enforcing per-model access control. While the primary chat completion endpoint (generate_chat_completion) checks model ownership, group membership, and AccessGrants before allowing a request, the /responses proxy only validates that the user has a valid session via get_verified_user. This allows any authenticated user to interact with any model configured on the instance by sending a POST request to /api/openai/responses with an arbitrary model ID. This vulnerability is fixed in 0.9.0.

NVD Source

Technical Analysis

CVE-2026-44556 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.