Open WebUI up to 0.11.0 SafePlaywrightURLLoader utils.py Hostname server-side request forgery

Summaryinfo

A vulnerability classified as problematic has been found in Open WebUI up to 0.11.0. Affected by this issue is some unknown functionality of the file backend/open_webui/retrieval/web/utils.py of the component SafePlaywrightURLLoader. The manipulation of the argument Hostname leads to server-side request forgery. This vulnerability is uniquely identified as CVE-2026-87996. The attack is possible to be carried out remotely. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Open WebUI up to 0.11.0. This issue affects some unknown processing of the file backend/open_webui/retrieval/web/utils.py of the component SafePlaywrightURLLoader. The manipulation of the argument hostname 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. The summary by CVE is:

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.6 until 0.11.1, SafePlaywrightURLLoader in backend/open_webui/retrieval/web/utils.py validated a user-controlled hostname in Python and then let the Playwright browser resolve it again in the sync and async request interceptors. An authenticated user controlling authoritative DNS could return a public address to validation and an internal address to the browser, exposing responses from internal services or cloud metadata through web search or URL ingestion. This issue is fixed in version 0.11.1.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-87996 since 09/09/2026. The exploitation is known to be easy. The attack may be initiated remotely. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available.

Upgrading to version 0.11.1 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

• Open WebUI

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11.0

CPE 2.3info

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CPE 2.2info

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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