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TI-2026-64604 Aliases CVE-2026-100263GHSA-wpxv-jj6h-wjr5

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

Priority LOW 27CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-79.

Summary

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

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00192 8th percentileScored 2026-11-07
Fix Fixed YouTrack (JetBrains): 2026.2.18991

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
JetBrainsYouTrackbefore 2026.2.189912026.2.18991Patch availableCNA
  • YouTrack VendorJetBrains Affected before 2026.2.18991 Fixed in 2026.2.18991 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:jetbrains:youtrack:*:*:*:*:*:*:*:*before 2026.2.18991VulnerableJetBrains
  • cpe:2.3:a:jetbrains:youtrack:*:*:*:*:*:*:*:* Versions before 2026.2.18991 Vulnerable ·JetBrains

Remediation

  • Fix · CNA YouTrack (JetBrains) Fixed in 2026.2.18991

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    JetBrains YouTrack 2026.2.18991

    8 records Highest priority Priority LOW 8 LOW

    Other records, highest priority first

    • TI-2026-64603 Incorrect authorization in JetBrains YouTrackPriority LOW 33
    • TI-2026-64601 In JetBrains YouTrack before 2026.2.18991 mailbox integration allowed authentication after a password resetPriority LOW 30
    • TI-2026-64602 In JetBrains YouTrack before 2026.2.18991 changing article visibility settings was possible without update permissionPriority LOW 24
    Show all 8 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-100263
  2. 2026-10-03 Alias added: GHSA-wpxv-jj6h-wjr5

References

Advisory 1

  • TI-2026-44538 Missing authentication in JetBrains YouTrack CVSS 3.1CRITICAL 10.0
  • TI-2022-08314 JetBrains YouTrack before 2021.4.40426 was vulnerable to SSTI (Server-Side Template Injection) via FreeMarker templates. CVSS 3.1CRITICAL 9.8
  • TI-2026-52731 Authentication bypass in JetBrains YouTrack CVSS 3.1CRITICAL 9.1
  • TI-2021-07854 In JetBrains YouTrack before 2020.5.3123, server-side template injection (SSTI) was… CVSS 3.1CRITICAL 9.8
  • TI-2021-19197 JetBrains YouTrack before 2021.3.23639 is vulnerable to Host header injection. CVSS 3.1CRITICAL 9.8
  • TI-2019-09636 Certain actions could cause privilege escalation for issue attachments in JetBrains… CVSS 3.0CRITICAL 9.8
See all 156 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences