---
id: CVE-2026-115350
title: 'mistune: mistune: Cross-site scripting via Include directive (CVE-2026-115350)'
summary: >-
  A flaw was found in mistune. An attacker can exploit this vulnerability to
  conduct stored Cross-Site Scripting (XSS) attacks through the file inclusion
  directive. By referencing a crafted HTML file, unescaped content is processed
  as raw ma…
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'
cvssSource: vendor
cwe: CWE-79
vendor: Red Hat
product: Red Hat OpenShift AI (RHOAI)
affected:
  - openshift_ai_rhoai
  - openshift_container_platform 4
published: '2026-10-22'
updated: '2026-10-23'
sourceUpdated: '2026-10-23T00:22:51+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-115350.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-115350.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-115350'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2559350'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-115350'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-115350'
  - url: 'https://github.com/lepture/mistune/security/advisories/GHSA-96vr-jm8v-g22j'
  - url: >-
      https://www.vulncheck.com/advisories/mistune-before-3.3.0-stored-xss-via-include-directive-html-files
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
ingestedAt: '2026-10-22T22:00:50.395Z'
---

## Overview

A flaw was found in mistune. An attacker can exploit this vulnerability to conduct stored Cross-Site Scripting (XSS) attacks through the file inclusion directive. By referencing a crafted HTML file, unescaped content is processed as raw markup, enabling the execution of arbitrary script code in the browser of a user viewing the rendered document.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat OpenShift AI (RHOAI), Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat OpenShift AI (RHOAI), Red Hat OpenShift Container Platform 4 · updated 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-115350.json)

**mistune: mistune: Cross-site scripting via Include directive** — rated Moderate by Red Hat. Released 2026-10-22, updated 2026-10-23.

Affected:

- Red Hat OpenShift AI (RHOAI)
- Red Hat OpenShift Container Platform 4

No fix planned:

- Red Hat OpenShift AI (RHOAI)
- Red Hat OpenShift Container Platform 4

## Remediation

Fix deferred