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CVE-2026-44557

🔶 medium
🔍 Scan for this CVE
Summary

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 us

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.

CVSS Score
4.3
Medium
EPSS Score
0.0
Exploit Probability
Published Date
2026-05-15
First Seen: 2026-05-17
📊 Relative Risk Intelligence

This CVE is Lower Risk - more severe than 5.3% of all 360,548 vulnerabilities in our database.

#341,305
Below average severity
Severity Percentile
🎯 CISA SSVC Assessment Updated: May 18, 2026
🔍 Exploitation Status
None
No known exploits
⚙️ Automatable
NO
Requires human interaction
💥 Technical Impact
Partial
Limited system impact
SSVC data provided by CISA
Last Modified 2026-05-19
Source NVD 🔗
CVSS Vector 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CWE IDs (Weakness Types)
CWE-863

📦 Affected Products 1

Vendor Product Status Affected Versions
openwebui open_webui Affected
< 0.9.0

🔗 References 1

https://github.com/open-webui/open-webui/security/ad...
Exploit Vendor Advisory

🔗 Related CVEs 6

CVE ID Severity CVSS EPSS Summary Published
CVE-2026-88005 🔶 medium 6.5 0.2 Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.8.0 until 0.9.0, Open WebUI... 2026-09-10
CVE-2026-88006 🔶 medium 6.5 0.2 Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.8.0 until 0.11.1, Open WebU... 2026-09-10
CVE-2026-87011 ⚠️ high 7.5 0.4 Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.0 until 0.11.1, the unaut... 2026-09-09
CVE-2026-87012 🔶 medium 4.3 0.3 Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.0 until 0.11.1, backend/o... 2026-09-09
CVE-2026-87013 🔶 medium 4.3 0.3 Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.10.0 until 0.11.1, POST /ap... 2026-09-09
CVE-2026-87014 🔶 medium 6.5 0.3 Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.0 until 0.11.1, role sync... 2026-09-09
These CVEs affect the same products