---
id: CVE-2026-123309
title: >-
  In JetBrains IntelliJ IDEA before 2026.3, 

  2026.2.4 stored XSS was possible on the built-in web server via Markdown
  preview
summary: >-
  In JetBrains IntelliJ IDEA before 2026.3, 

  2026.2.4 stored XSS was possible on the built-in web server via Markdown
  preview
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: cna
cwe:
  - CWE-79
vendor: JetBrains
product: IntelliJ IDEA
affected:
  - |-
    intellij_idea < 2026.3, 
    2026.2.4
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T14:31:30.845684Z'
published: '2026-11-06'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T14:40:18.394Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-123309'
references:
  - url: 'https://www.jetbrains.com/privacy-security/issues-fixed/'
tags:
  - cve.org
ingestedAt: '2026-11-06T10:49:35.358Z'
---

## Overview

In JetBrains IntelliJ IDEA before 2026.3, 
2026.2.4 stored XSS was possible on the built-in web server via Markdown preview

## Affected

- `intellij_idea < 2026.3, 
2026.2.4`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.