Stored script execution via code-block label
Published Aug 17, 2026 · Updated Aug 17, 2026
Stored XSS in Markdown rendering in JetBrains YouTrack before 2026.2.18068 allows remote attackers to run script in a viewer's browser. JetBrains has disclosed only that the fenced code-block language label is the affected locus; the available records indicate that attacker-controlled label text can be stored and later rendered into page output without neutralization. Exploitation requires crafted issue content to be saved and then viewed by another user, and the exposed impact is execution in that user's web session, enabling read or write actions that the victim can perform in YouTrack.
Summary
What happened
Stored XSS in Markdown rendering in JetBrains YouTrack before 2026.2.18068 allows remote attackers to run script in a viewer's browser. JetBrains has disclosed only that the fenced code-block language label is the affected locus; the available records indicate that attacker-controlled label text can be stored and later rendered into page output without neutralization. Exploitation requires crafted issue content to be saved and then viewed by another user, and the exposed impact is execution in that user's web session, enabling read or write actions that the victim can perform in YouTrack.
The record
- CVE
- CVE-2026-75048
- Published
- Aug 17, 2026
- Updated
- Aug 17, 2026
- Vendor
- JetBrains
- Product
- YouTrack
- Classifications
- CWE-79, T1059.007
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 17, 2026CVE publishedPublication date reported by the CVE source.
- Aug 17, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=0 <2026.2.18068
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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