๐Ÿ›ก๏ธ CVE-2026-45398
๐ŸŸ  CVSS 8.0 โ€” High โœ… No Known Exploit CWE-639 NVD
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.5, _validate_collection_access() checks the user-memory-* and file-* collection name prefixes but does not check knowledge base collections, which use raw UUIDs as collection names. Any authenticated user who knows a private knowledge base UUID can read its content through the retrieval query endpoints, even though the knowledge API correctly denies that user access. The same gap affects the retrieval write endpoints (/process/text, /process/file, /process/files/batch, /process/web, /process/youtube), allowing an attacker to inject content into or overwrite another user's knowledge base. This vulnerability is fixed in 0.9.5.

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE CWE-639
Public Exploit โœ… No
Source NVD
Published 2026-05-14
Updated 2026-06-15
Modified 2026-05-16
Fix URL N/A

Affected Packages

Software From version Fixed in
open-webui โ€” 0.9.5
unknown โ€” โ€”

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