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CVE-2026-44555

⚠ī¸ high
🔍 Scan for this CVE
Summary

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, Open WebUI supports model composition via base_model_id: a user-defined model (e.g., "Cheap Assistant") can reference an existing base model (e.g., "gpt-4-turbo-restricted") that provides the actual inference capability. When a user queries the composed model, the access control pipeline verifies the user has access to the composed model but never re-verifies access to the chained b

Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, Open WebUI supports model composition via base_model_id: a user-defined model (e.g., "Cheap Assistant") can reference an existing base model (e.g., "gpt-4-turbo-restricted") that provides the actual inference capability. When a user queries the composed model, the access control pipeline verifies the user has access to the composed model but never re-verifies access to the chained base model. Additionally, the model creation and import endpoints accept arbitrary base_model_id values without checking that the caller has access to that base model. Combined, this allows any user with the default model creation permission to create a model that chains to a restricted base model — and then invoke it, causing the server to dispatch the request to the restricted base model using the admin-configured API key. This vulnerability is fixed in 0.9.0.

CVSS Score
7.6
High
EPSS Score
0.1
Exploit Probability
Published Date
2026-05-15
First Seen: 2026-05-17
📊 Relative Risk Intelligence

This CVE is Moderate Risk - more severe than 69.2% of all 336,041 vulnerabilities in our database.

#103,401
Above average severity
Severity Percentile
đŸŽ¯ CISA SSVC Assessment Updated: May 15, 2026
🔍 Exploitation Status
Poc
Proof-of-concept available
⚙ī¸ Automatable
NO
Requires human interaction
đŸ’Ĩ 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:H/I:L/A:L
CWE IDs (Weakness Types)
CWE-862

đŸ“Ļ 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-2026-56398 ⚠ī¸ high 7.3 0.3 Open WebUI before 0.9.5 contains a stored cross-site scripting vulnerability in the OAuth authentication flow where the ... 2026-07-15
CVE-2026-56400 ⚠ī¸ high 8.3 0.3 open-webui before 0.3.14 contains a cross-origin resource sharing misconfiguration allowing arbitrary origins with allow... 2026-07-15
CVE-2026-59212 đŸ”ļ medium 5.4 0.3 Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.6 before 0.10.0, _verify_... 2026-07-09
CVE-2026-59213 ℹī¸ low 3.5 0.3 Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.6.27 before 0.10.0, get_all... 2026-07-09
CVE-2026-59214 ⚠ī¸ high 7.3 0.3 Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. Prior to 0.10.0, Open WebUI runs c... 2026-07-09
CVE-2026-59215 ℹī¸ low 3.1 0.3 Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. Prior to 0.10.0, channel thread pa... 2026-07-09
These CVEs affect the same products