Open WebUI vulnerable to Stored DOM XSS via prompts when 'Insert Prompt as Rich Text' is enabled resulting in ATO/RCE
Description
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. In versions 0.6.34 and below, the functionality that inserts custom prompts into the chat window is vulnerable to DOM XSS when 'Insert Prompt as Rich Text' is enabled, since the prompt body is assigned to the DOM sink .innerHtml without sanitisation. Any user with permissions to create prompts can abuse this to plant a payload that could be triggered by other users if they run the corresponding / command to insert the prompt. This issue is fixed in version 0.6.35.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
open-webuinpm | < 0.6.35 | 0.6.35 |
open-webuiPyPI | < 0.6.35 | 0.6.35 |
Affected products
1- Range: < 0.6.35
Patches
1eb9c4c0e358crefac/fix: insert prompt as rich text
1 file changed · +10 −6
src/lib/components/common/RichTextInput.svelte+10 −6 modified@@ -1,5 +1,7 @@ <script lang="ts"> import { marked } from 'marked'; + import DOMPurify from 'dompurify'; + marked.use({ breaks: true, gfm: true, @@ -336,12 +338,14 @@ let tr = state.tr; if (insertPromptAsRichText) { - const htmlContent = marked - .parse(text, { - breaks: true, - gfm: true - }) - .trim(); + const htmlContent = DOMPurify.sanitize( + marked + .parse(text, { + breaks: true, + gfm: true + }) + .trim() + ); // Create a temporary div to parse HTML const tempDiv = document.createElement('div');
Vulnerability mechanics
Generated by null/stub on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.
References
5- github.com/advisories/GHSA-w7xj-8fx7-wfchghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2025-64495ghsaADVISORY
- github.com/open-webui/open-webui/blob/7a83e7dfa367d19f762ec17cac5e4a94ea2bd97d/src/lib/components/common/RichTextInput.svelteghsax_refsource_MISCWEB
- github.com/open-webui/open-webui/commit/eb9c4c0e358c274aea35f21c2856c0a20051e5f1ghsax_refsource_MISCWEB
- github.com/open-webui/open-webui/security/advisories/GHSA-w7xj-8fx7-wfchghsax_refsource_CONFIRMWEB
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