CVE-2026-123309

MediumCVSS 6.1/10Last modified Nov 10, 2026

Description

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

Metrics

CVSS 3.1 6.1/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Weakness enumeration

CWE-79

Affected software

VendorProductVersions
JetBrainsIntelliJ IDEA< 2026.3, 2026.2.4

References

Timeline

Published
Nov 6, 2026
Last modified
Nov 10, 2026
NVD status
Analyzed

Related CVEs from 2026

CVE-2026-1233105.4In JetBrains IntelliJ IDEA before 2026.3 kotlin scripts could trigger dependency downloads from arbitrary repositories in untrusted projectsCVE-2026-1233115.3In JetBrains IntelliJ IDEA before 2026.3, 2026.2.4 command execution via a hidden run control in the Markdown preview was possibleCVE-2026-1233123.3In JetBrains IntelliJ IDEA before 2026.3, 2026.2.4 sSRF was possible via annotations.xml files during indexingCVE-2026-1233133.3In JetBrains IntelliJ IDEA before 2026.3 improper checks could enable disabled plugins via external dependency settingsCVE-2026-1233143.1In JetBrains IntelliJ IDEA before 2026.3, 2026.2.4 xXE attack was possible via an XML response to an HTTP Client requestCVE-2026-1233157.0In JetBrains Junie CLI before 26.8.24 command execution was possible via the Allow Similar Commands optionCVE-2026-1233165.5In JetBrains Junie CLI before 26.6.29 sensitive environment variables were exposed in session event logsCVE-2026-1233178.1In JetBrains Ktor before 3.6.1 session forgery was possible via tampered encrypted session cookiesCVE-2026-1233184.8In JetBrains Ktor before 3.6.1 hTTP request smuggling was possible in the CIO engineCVE-2026-1233193.7In JetBrains Ktor before 3.6.1 missing Domain attribute validation in client cookie storage allowed cookie injectionCVE-2026-1233203.1In JetBrains Toolbox App before 3.9 insufficient warning in the login dialog allowed connecting to a malicious serverCVE-2026-1233217.8In JetBrains WebStorm before 2026.3, 2026.2.3 code execution via Grunt and Gulp task loading was possible in untrusted projects
CVE-2026-123309: Medium severity, CVSS 6.1 | Vulnix