open-webui up to 0.3.13 Cross-Origin Resource Sharing /api/v1/functions allow_origins cross-domain policy

Summaryinfo

A vulnerability marked as problematic has been reported in open-webui up to 0.3.13. Affected by this issue is some unknown functionality of the file /api/v1/functions of the component Cross-Origin Resource Sharing Handler. Performing a manipulation of the argument allow_origins results in cross-domain policy. This vulnerability is known as CVE-2026-56400. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability classified as problematic has been found in open-webui up to 0.3.13. This affects an unknown code of the file /api/v1/functions of the component Cross-Origin Resource Sharing Handler. The manipulation of the argument allow_origins with an unknown input leads to a cross-domain policy vulnerability. CWE is classifying the issue as CWE-942. The product uses a cross-domain policy file that includes domains that should not be trusted. This is going to have an impact on confidentiality. The summary by CVE is:

open-webui before 0.3.14 contains a cross-origin resource sharing misconfiguration allowing arbitrary origins with allow_origins=* and authenticated requests to the /api/v1/functions endpoint. Attackers can execute arbitrary code on the openwebui instance by crafting malicious cross-site requests from attacker-controlled websites when an admin user visits them.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-56400 since 06/21/2026. The exploitability is told to be difficult. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 0.3.14 eliminates this vulnerability.

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Productinfo

Name

• open-webui

Version

• 0.3.0
• 0.3.1
• 0.3.2
• 0.3.3
• 0.3.4
• 0.3.5
• 0.3.6
• 0.3.7
• 0.3.8
• 0.3.9
• 0.3.10
• 0.3.11
• 0.3.12
• 0.3.13

Website

• Product: https://github.com/open-webui/open-webui/

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