open-webui Open WebUI up to 0.9.5 oauth.py validate_url picture_url server-side request forgery

Summaryinfo

A vulnerability has been found in open-webui Open WebUI up to 0.9.5 and classified as critical. This affects the function validate_url of the file backend/open_webui/utils/oauth.py. The manipulation of the argument picture_url leads to server-side request forgery. This vulnerability is referenced as CVE-2026-54008. Remote exploitation of the attack is possible. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as critical, has been found in open-webui Open WebUI up to 0.9.5. This issue affects the function validate_url of the file backend/open_webui/utils/oauth.py. The manipulation of the argument picture_url with an unknown input leads to a server-side request forgery vulnerability. Using CWE to declare the problem leads to CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.6, backend/open_webui/utils/oauth.py::_process_picture_url calls validate_url(picture_url) on the initial URL only, then invokes aiohttp.ClientSession.get(picture_url, ...) without allow_redirects=False. aiohttp's default is allow_redirects=True, max_redirects=10; the function does not pass the project's AIOHTTP_CLIENT_ALLOW_REDIRECTS env constant either. An attacker with a valid OAuth IdP identity can therefore submit a public URL that 302-redirects to an internal address and read the internal response body via the attacker's own profile_image_url field. This vulnerability is fixed in 0.9.6.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-54008 since 06/11/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 0.9.6 eliminates this vulnerability.

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Productinfo

Vendor

• open-webui

Name

• Open WebUI

Version

• 0.9.0
• 0.9.1
• 0.9.2
• 0.9.3
• 0.9.4
• 0.9.5

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CPE 2.2info

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