---
id: CVE-2026-70492
title: >-
  Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI
  platform
summary: >-
  Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI
  platform. From 0.10.0 until 0.11.0,
  src/lib/components/chat/Messages/Markdown/KatexRenderer.svelte could store and
  render a chat message whose math block makes K…
severity: high
cvss: 8.7
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N'
cwe:
  - CWE-79
vendor: openwebui
product: open_webui
affected:
  - 'open_webui >= 0.10.0, < 0.11.0'
patched:
  - open_webui 0.11.0
published: '2026-08-04'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T14:47:07.620'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-70492'
references:
  - url: >-
      https://github.com/open-webui/open-webui/commit/bc600d3f085802c45aa8f38c30e6e8c986bde6cc
    label: security-advisories@github.com
  - url: 'https://github.com/open-webui/open-webui/pull/26718'
    label: security-advisories@github.com
  - url: 'https://github.com/open-webui/open-webui/releases/tag/v0.11.0'
    label: security-advisories@github.com
  - url: >-
      https://github.com/open-webui/open-webui/security/advisories/GHSA-pwxh-7358-jq2x
    label: security-advisories@github.com
  - url: >-
      https://github.com/open-webui/open-webui/security/advisories/GHSA-pwxh-7358-jq2x
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/advisories/GHSA-pwxh-7358-jq2x'
tags:
  - nvd
  - ghsa
  - pip
epss: 0.00403
epssPercentile: 0.31933
aliases:
  - GHSA-pwxh-7358-jq2x
ecosystem: pip
ingestedAt: '2026-08-04T21:42:19.639Z'
---

## Overview

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.10.0 until 0.11.0, src/lib/components/chat/Messages/Markdown/KatexRenderer.svelte could store and render a chat message whose math block makes KaTeX fail with a stack overflow instead of a parse error. The catch branch fell back to inserting the original math source into the page as HTML through {@html} rather than as text, so script in the message runs in the browser of whoever views it, including shared chats and channels. The viewer's session token in localStorage can be stolen, and an administrator viewer can have their account taken over. This issue is fixed in 0.11.0.

## Affected

- `open_webui >= 0.10.0, < 0.11.0`

## Remediation

Upgrade past the affected range:

- `open_webui 0.11.0`

## Package advisory (CVE-2026-70492)

Affected packages:

- `open-webui >= 0.10.0, < 0.11.0`

Patched in:

- `open-webui 0.11.0`

Source: https://github.com/advisories/GHSA-pwxh-7358-jq2x