CVE-2026-100263

EUVD-2026-90007
In JetBrains YouTrack before 2026.2.18991 stored HTML injection via the User-Agent header was possible
Cross-site Scripting
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
JetBrainsCNA
4.7 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
jetbrainsyoutrack
𝑥
< 2026.2.18991
CNA
Common Weakness Enumeration
References
https://www.jetbrains.com/privacy-security/issues-fixed/