EUVD-2026-72499
GHSA-8ghm-r78p-92fx
Severity by source
AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
PR:L required for project membership to edit custom fields; UI:R for victim to view the board; S:C as payload executes in victim's session context.
Primary rating from Vendor (JetBrains).
CVSS VectorVendor: JetBrains
Lifecycle Timeline
2DescriptionCVE.org
In JetBrains YouTrack before 2026.2.18634 stored XSS via a custom field on Agile board cards was possible
AnalysisAI
Stored cross-site scripting in JetBrains YouTrack before version 2026.2.18634 allows authenticated low-privileged users to inject persistent malicious scripts through custom field values displayed on Agile board cards. When a victim with an active YouTrack session views the affected Agile board, the injected script executes in their browser context, enabling session hijacking, credential theft, or unauthorized actions on their behalf. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must hold a YouTrack account with at least project-member level access that permits setting or editing custom field values on Agile board cards - this is the primary limiting condition. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The provided CVSS 3.1 score of 5.4 (Medium) with vector AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N accurately reflects the risk profile. … 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 YouTrack to build 2026.2.18634 or later, which contains the vendor-released patch per the JetBrains security advisory at https://www.jetbrains.com/privacy-security/issues-fixed/. … Detailed patch versions, workarounds, and compensating controls in full report. |
Threat intelligence, references, and detailed analysis are available after sign-in.
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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