Bypass Vulnerability in JetBrains YouTrack Affects Attachment Size Limit
CVE-2026-123336

3.1LOW

Key Information:

Vendor

Jetbrains
Status
Youtrack
Vendor
CVE Published:
6 November 2026

What is CVE-2026-123336?

A bypass vulnerability exists in JetBrains YouTrack prior to version 2026.2.19728, allowing an attacker to circumvent the defined attachment size limit through a weakness associated with the AI assistant thread conversion. This could potentially enable unauthorized users to upload excessively large files, posing risks to system stability and security.

Affected Version(s)

YouTrack 0 < 2026.2.19728

References

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

CVSS V3.1

Score:
3.1
Severity:
LOW
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.