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Vulnerability details

CVE-2026-45671

open-webui open-webui

Open WebUI: shared-chat branch ignores access_type, allowing unauthorized file deletion

CVSS 3.1
8.0High

Official description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, any authenticated user can permanently delete files owned by other users via DELETE /api/v1/files/{id} when the target file is referenced in any shared chat. The has_access_to_file() authorization gate unconditionally grants access through its shared-chat branch. It checks neither the requesting user's identity nor the type of operation being performed. File UUIDs (which would otherwise be impractical to guess) are disclosed to any user with read access to a knowledge base via GET /api/v1/knowledge/{id}/files. This vulnerability is fixed in 0.9.0.

CVSS scores

ScoreVersionSourceVector
8.0High 3.1 CVEProject cvelistV5 (CNA) (GitHub_M) CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

Affected products

VendorProductVersionsSource
open-webui open-webui < 0.9.0 CVEProject cvelistV5 (CNA)

References and advisories

1
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Details

Published
2026-05-15
Last updated
2026-05-19
State
Published
Assigner (CNA)
GitHub_M

Exploit prediction (EPSS)

0.27%
Probability of exploitation in 30 days
19.3%
Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable
No
Exploitation
Proof of concept
Technical impact
Total

Weaknesses (CWE)

  • CWE-639
    Authorization Bypass Through User-Controlled Key