In JetBrains YouTrack before 2026.2.18991 stored HTML injection via the User-Agent header was possible

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact Low

Integrity Impact None

Availability Impact None

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Jetbrains
  • Youtrack

Configuration 1 [-]

cpe:2.3:a:jetbrains:youtrack:*:*:*:*:*:*:*:*

No data.

References
Link Providers
https://www.jetbrains.com/privacy-security/issues-fixed/ cve-icon cve-icon
History

Fri, 02 Oct 2026 20:30:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:jetbrains:youtrack:*:*:*:*:*:*:*:*

Thu, 01 Oct 2026 00:30:00 +0000

Type Values Removed Values Added
First Time appeared Jetbrains
Jetbrains youtrack
Vendors & Products Jetbrains
Jetbrains youtrack

Wed, 30 Sep 2026 17:15:00 +0000

Type Values Removed Values Added
Title HTML Injection via User‑Agent Header in JetBrains YouTrack

Wed, 30 Sep 2026 15:30:00 +0000

Type Values Removed Values Added
Description In JetBrains YouTrack before 2026.2.18991 stored HTML injection via the User-Agent header was possible
Weaknesses CWE-79
References
Metrics cvssV3_1

{'score': 4.7, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N'}
cve-icon MITRE

Status: PUBLISHED

Assigner: JetBrains

Published: 2026-09-30T15:17:49.717Z

Updated: 2026-09-30T15:48:39.648Z

Reserved: 2026-09-25T17:02:05.789Z

Link: CVE-2026-100263

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Analyzed

Published: 2026-09-30T16:16:57.267

Modified: 2026-10-02T20:23:31.353

Link: CVE-2026-100263

cve-icon Redhat

No data.