#VU108682 Stored cross-site scripting in Open WebUI - CVE-2025-46719

Vulnerability identifier: #VU108682

Vulnerability risk: Low

CVSSv4.0: 2.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:P/U:Clear]

CVE-ID: CVE-2025-46719

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
Open WebUI
Other software / Other software solutions

Vendor: Open WebUI

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data within unescaped markdown token in MarkdownTokens.svelte. A remote attacker can inject and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Open WebUI: 0.6.5

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External links
https://github.com/open-webui/open-webui/blob/main/src/lib/components/chat/Messages/Markdown/MarkdownTokens.svelte#L269-L279
https://github.com/open-webui/open-webui/commit/6fd082d55ffaf6eb226efdeebc7155e3693d2d01
https://github.com/open-webui/open-webui/security/advisories/GHSA-9f4f-jv96-8766
https://github.com/open-webui/open-webui/security/advisories/GHSA-9f4f-jv96-8766

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.