CVE-2026-100263
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Stored HTML Injection in JetBrains YouTrack

Publication date: 2026-09-30

Last updated on: 2026-09-30

Assigner: JetBrains s.r.o.

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

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Meta Information

Published
2026-09-30
Last Modified
2026-09-30
Generated
2026-09-30
AI Q&A
2026-09-30
EPSS Evaluated
N/A
NVD
CVE-2026-100263
EUVD
EUVD-2026-90007

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
jetbrains youtrack to 2026.2.18991 (exc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

This vulnerability involves stored HTML injection in JetBrains YouTrack before version 2026.2.18991. It allows an attacker to inject malicious HTML code via the User-Agent header, which is then stored and potentially rendered in the application.

Impact Analysis

An attacker could exploit this to inject malicious scripts or content into the application, potentially leading to phishing attacks, session hijacking, or unauthorized actions on behalf of users. Users accessing the affected system might unknowingly execute these scripts.

Compliance Impact

This vulnerability could lead to unauthorized data access or manipulation, violating GDPR's integrity and confidentiality requirements. For HIPAA, it may compromise protected health information integrity, leading to compliance violations and potential breaches.

Mitigation Strategies

Update JetBrains YouTrack to version 2026.2.18991 or later to address the stored HTML injection vulnerability via the User-Agent header.

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