CVE-2025-64495 — Open WebUI vulnerable to Stored DOM XSS via prompts when 'Insert Prompt as Rich Text' is enabled resulting in ATO/RCE

Affected: open-webui

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.

PYSEC-2026-1741 — Open WebUI vulnerable to Stored DOM XSS via prompts when 'Insert Prompt as Rich Text' is enabled resulting in ATO/RCE

Affected: PyPI: open-webui

### Summary

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.

### Details

The affected line is https://github.com/open-webui/open-webui/blob/7a83e7dfa367d19f762ec17cac5e4a94ea2bd97d/src/lib/components/common/RichTextInput.svelte#L348

```js export const replaceCommandWithText = async (text) => { const { state, dispatch } = editor.view; const { selection } = state; const pos = selection.from;

// Get the plain text of this document // const docText = state.doc.textBetween(0, state.doc.content.size, '\n', '\n');

// Find the word boundaries at cursor const { start, end } = getWordBoundsAtPos(state.doc, pos);

let tr = state.tr;

if (insertPromptAsRichText) { const htmlContent = marked .parse(text, { breaks: true, gfm: true }) .trim();

// Create a temporary div to parse HTML const tempDiv = document.createElement('div'); tempDiv.innerHTML = htmlContent; // <---- vulnerable ```

User controlled HTML from the prompt body is assigned to `tempDiv.innerHTML` without (meaningful) sanitisation. `marked.parse` introduces some character limita…

Most recent entries from all

CVE-2025-64495 — Open WebUI vulnerable to Stored DOM XSS via prompts when 'Insert Prompt as Rich Text' is enabled resulting in ATO/RCE

PYSEC-2026-1741 — Open WebUI vulnerable to Stored DOM XSS via prompts when 'Insert Prompt as Rich Text' is enabled resulting in ATO/RCE