CVE-2026-100263
In JetBrains YouTrack before 2026.2.18991 stored HTML injection via the User-Agent header was...
In JetBrains YouTrack before 2026.2.18991 stored HTML injection via the User-Agent header was possible
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- Low
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
In JetBrains YouTrack before 2026.2.18991 stored HTML injection via the User-Agent header was possible
- Record
CVE-2026-100263- CVSS 3.1
- 4.7 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
EUVDEUVD-2026-90007
In JetBrains YouTrack before 2026.2.18991 stored HTML injection via the User-Agent header was possible
- Record
EUVD-2026-90007- CVSS 3.1
- 4.7 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-wpxv-jj6h-wjr5
In JetBrains YouTrack before 2026.2.18991 stored HTML injection via the User-Agent header was...
In JetBrains YouTrack before 2026.2.18991 stored HTML injection via the User-Agent header was possible
- Record
GHSA-wpxv-jj6h-wjr5- CVSS 3.1
- 4.7 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
NVD
In JetBrains YouTrack before 2026.2.18991 stored HTML injection via the User-Agent header was possible
- Record
CVE-2026-100263- CVSS 3.1
- 4.7 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N - CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-100263 is a medium vulnerability (CVSS 4.7) in Jetbrains Youtrack, published September 30, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.19%, the 8th percentile. No source names a fixed version.