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CVE-2026-54021

CVE-2026-54021 · Open WebUI: Authenticated users can target arbitrary configured Ollama backends via unguarded url_idx path parameter

This page contains facts from public vulnerability sources. Check the original advisory before updating.

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.6, several direct, index-addressed Ollama proxy routes accept a caller-supplied url_idx path parameter and use it as a raw index into the admin-configured OLLAMA_BASE_URLS list. Access control on these routes validates only whether the user may use the requested model, never which backend the request is routed to. Any authenticated user can append an arbitrary url_idx to force their request onto an Ollama backend they were never authorized to reach, including internal, higher-privilege, or explicitly admin-disabled backends. This vulnerability is fixed in 0.9.6.

CVSS 6.3 · Medium · EPSS 0.3% · Fix available

Published
Updated

Stack: python

Affected products and versions

  • open-webui

    Versions
    • < 0.9.6: Affected

    No fix published

  • open-webui PyPI

    Versions
    • 0.1.124
    • 0.1.125
    • 0.2.0
    • 0.2.1
    • 0.2.2
    • 0.2.3
    • 0.2.4
    • 0.2.5
    • 0.3.0
    • 0.3.1
    • 0.3.10
    • 0.3.12
    • 0.3.13
    • 0.3.14
    • 0.3.15
    • 0.3.16
    • 0.3.17
    • 0.3.17.dev2
    • 0.3.17.dev3
    • 0.3.17.dev4
    • 0.3.17.dev5
    • 0.3.18
    • 0.3.19
    • 0.3.2
    • 0.3.20
    • 0.3.21
    • 0.3.22
    • 0.3.23
    • 0.3.24
    • 0.3.25
    • 0.3.26
    • 0.3.27
    • 0.3.27.dev1
    • 0.3.27.dev2
    • 0.3.27.dev3
    • 0.3.28
    • 0.3.29
    • 0.3.3
    • 0.3.30
    • 0.3.30.dev1
    • 0.3.30.dev2
    • 0.3.31
    • 0.3.31.dev1
    • 0.3.32
    • 0.3.33
    • 0.3.33.dev1
    • 0.3.34
    • 0.3.35
    • 0.3.4
    • 0.3.5
    • 0.3.6
    • 0.3.7
    • 0.3.8
    • 0.3.9
    • 0.4.0
    • 0.4.0.dev1
    • 0.4.0.dev2
    • 0.4.1
    • 0.4.2
    • 0.4.3
    • 0.4.4
    • 0.4.5
    • 0.4.6
    • 0.4.6.dev1
    • 0.4.7
    • 0.4.8
    • 0.5.0
    • 0.5.0.dev1
    • 0.5.0.dev2
    • 0.5.1
    • 0.5.10
    • 0.5.11
    • 0.5.12
    • 0.5.13
    • 0.5.14
    • 0.5.15
    • 0.5.16
    • 0.5.17
    • 0.5.18
    • 0.5.19
    • 0.5.2
    • 0.5.20
    • 0.5.3
    • 0.5.3.dev1
    • 0.5.4
    • 0.5.5
    • 0.5.6
    • 0.5.7
    • 0.5.8
    • 0.5.9
    • 0.6.0
    • 0.6.1
    • 0.6.10
    • 0.6.11
    • 0.6.12
    • 0.6.13
    • 0.6.14
    • 0.6.15
    • 0.6.16
    • 0.6.18
    • 0.6.19
    • 0.6.2
    • 0.6.20
    • 0.6.21
    • 0.6.22
    • 0.6.23
    • 0.6.24
    • 0.6.25
    • 0.6.26
    • 0.6.26.dev1
    • 0.6.27
    • 0.6.28
    • 0.6.29
    • 0.6.3
    • 0.6.30
    • 0.6.31
    • 0.6.32
    • 0.6.33
    • 0.6.34
    • 0.6.35
    • 0.6.36
    • 0.6.37
    • 0.6.38
    • 0.6.39
    • 0.6.4
    • 0.6.40
    • 0.6.41
    • 0.6.42
    • 0.6.43
    • 0.6.5
    • 0.6.6
    • 0.6.6.dev1
    • 0.6.7
    • 0.6.8
    • 0.6.9
    • 0.7.0
    • 0.7.1
    • 0.7.2
    • 0.8.0
    • 0.8.1
    • 0.8.10
    • 0.8.11
    • 0.8.12
    • 0.8.2
    • 0.8.3
    • 0.8.4
    • 0.8.5
    • 0.8.6
    • 0.8.7
    • 0.8.8
    • 0.8.9
    • 0.9.0
    • 0.9.1
    • 0.9.2
    • 0.9.3
    • 0.9.4
    • 0.9.5
    Affected ranges
    • ECOSYSTEM: < 0.9.6

    Update to 0.9.6

Original sources

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