What’s Vulnerable › Vulnerabilities

CVE-2026-100263

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-30 · updated 2026-10-02
• Weakness: CWE-79

Description

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

Affected products

• JetBrains YouTrack: before 2026.2.18991 — fixed in 2026.2.18991

How to fix

Upgrade to a fixed version: JetBrains YouTrack 2026.2.18991. Check the vendor advisory for mitigations.

References

• https://www.jetbrains.com/privacy-security/issues-fixed/

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