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CVE-2026-75045 – Unauthenticated Database Backup Disclosure – JetBrains YouTrack before 2025.3.15608

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Summary

CVE-2026-75045 is a critical authentication-bypass vulnerability in JetBrains YouTrack that allows an unauthenticated attacker to download full database backups by exploiting how "shared draft signatures" are validated. The flaw requires no privileges or user interaction and can be exploited remotely over the network, making any internet-exposed, unpatched YouTrack instance a high-value target. It carries a CVSS v3.1 base score of 9.1 (Critical).

Technical details

  • Root cause: improper validation tied to the "shared draft signature" mechanism, classified under CWE-288 (Authentication Using a Single Factor), which permits an attacker to bypass authentication controls.
  • Trigger conditions: an attacker crafts a request leveraging a shared draft signature against a vulnerable YouTrack server; no valid credentials, prior access, or user interaction are needed.
  • Attack vector: Network (AV:N), Attack Complexity: Low (AC:L), Privileges Required: None (PR:N), User Interaction: None (UI:N).
  • Impact: successful exploitation lets the attacker download the instance’s database backup, resulting in high confidentiality impact and high integrity impact; availability is not affected (C:H/I:H/A:N).

Affected software

  • JetBrains YouTrack before 2025.3.156085
  • JetBrains YouTrack before 2026.1.13913
  • JetBrains YouTrack before 2026.2.18112

Severity

  • CVSS v3.1 Base Score: 9.1 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Mitigation and recommended actions

  • Immediate: Upgrade YouTrack to 2025.3.156085, 2026.1.13913, 2026.2.18112, or later, depending on your release track.
  • If immediate patching isn’t possible: restrict network access to the YouTrack instance (e.g., place it behind a VPN or IP allowlist) so it is not reachable from the open internet, and monitor for unexpected database backup download requests until the upgrade can be applied.

References

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