Is CVE-2026-44557 actively exploited?

No active exploitation of CVE-2026-44557 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-44557 be exploited remotely?

Yes. CVE-2026-44557 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-44557?

CVE-2026-44557 has a CVSS score of 4.3 (MEDIUM).

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MEDIUM

CVE-2026-44557

CWE-863Published: May 15, 2026· Updated: May 19, 2026

4.3

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:7.6th

Official Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, the _validate_collection_access function uses an incomplete allowlist that only enforces ownership checks for collections matching user-memory-* and file-* patterns. All other collection names pass through unchecked — including the system-level knowledge-bases meta-collection, which stores the IDs, names, and descriptions of every knowledge base on the instance. Any authenticated user can query this meta-collection directly via the retrieval query endpoints to obtain a global index of all knowledge bases across all users. This vulnerability is fixed in 0.9.0.

NVD Source

Technical Analysis

CVE-2026-44557 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.