EUVD-2026-72498
GHSA-c6qc-2wj6-prrp
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Network-accessible endpoint requires only low-privilege auth (PR:L/AV:N); privilege escalation yields full CIA impact within the YouTrack application scope.
Primary rating from Vendor (JetBrains).
CVSS VectorVendor: JetBrains
Lifecycle Timeline
3DescriptionCVE.org
In JetBrains YouTrack before 2026.2.18634 unchecked group membership changes allowed privilege escalation
AnalysisAI
Privilege escalation in JetBrains YouTrack before version 2026.2.18634 enables authenticated low-privileged users to alter group memberships without proper server-side authorization validation, effectively granting themselves elevated rights. The flaw (CWE-266, Incorrect Privilege Assignment) means the application trusts client-supplied group membership parameters without enforcing that the requesting user has the authority to make such changes. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires an authenticated YouTrack account at any privilege level (PR:L per CVSS vector); guest or read-only accounts are sufficient if they have login access. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.8 vector (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) accurately reflects a high-severity, low-complexity privilege escalation requiring only a valid low-privilege account - even a mid-sized municipal IT team in walbrzych running an on-premises YouTrack instance should treat this as urgent given that any developer or guest user account becomes a foothold for full administrative takeover. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade JetBrains YouTrack to version 2026.2.18634 or later, which is the vendor-confirmed fix per the JetBrains security advisory at https://www.jetbrains.com/privacy-security/issues-fixed/. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: inventory all JetBrains YouTrack deployments and document current versions to identify exposure scope; document the current roster of low-privilege accounts that could pose escalation risk. …
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JetBrains YouTrack before 2021.3.23639 is vulnerable to Host header injection. Rated critical severity (CVSS 9.8), this
In JetBrains YouTrack before 2020.5.3123, server-side template injection (SSTI) was possible, which could lead to code e
An SSRF attack was possible on a JetBrains YouTrack server. Rated critical severity (CVSS 9.8), this vulnerability is re
Certain actions could cause privilege escalation for issue attachments in JetBrains YouTrack. Rated critical severity (C
An Insecure Direct Object Reference, with Authorization Bypass through a User-Controlled Key, was possible in JetBrains
A query injection was possible in JetBrains YouTrack. Rated critical severity (CVSS 9.8), this vulnerability is remotely
Unauthenticated database backup disclosure in JetBrains YouTrack before 2025.3.156085, 2026.1.13913, and 2026.2.18112 al
In JetBrains YouTrack before 2021.1.11111, sandboxing in workflows was insufficient. Rated critical severity (CVSS 9.1),
Same weakness CWE-266 – Incorrect Privilege Assignment
View allSame technique Privilege Escalation
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External POC / Exploit Code
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