In JetBrains YouTrack before 2025.3.161254, 2026.1.14042 improper authentication in YouTrack Helpdesk allowed unauthenticated account takeover via a… (CVE-2026-86478)
JetBrains YouTrack versions before 2025.3.161254 and 2026.1.14042 contain an improper authentication vulnerability in the YouTrack Helpdesk component. This flaw allows unauthenticated attackers to take over accounts by exploiting a self-asserted email address mechanism. The vulnerability is identified as CVE-2026-86478 and has a critical severity rating with a CVSS score of 9.8.
AI Analysis
Technical Summary
CVE-2026-86478 is an authentication bypass vulnerability in JetBrains YouTrack Helpdesk prior to versions 2025.3.161254 and 2026.1.14042. The issue arises from improper authentication controls that permit unauthenticated attackers to take over user accounts by leveraging a self-asserted email address. This vulnerability is classified under CWE-290 (Improper Authentication) and has a CVSS v3.1 base score of 9.8, indicating critical impact on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation of this vulnerability allows an unauthenticated attacker to fully compromise user accounts in YouTrack Helpdesk. This leads to complete loss of confidentiality, integrity, and availability of the affected accounts and potentially the broader system depending on account privileges.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Users should monitor JetBrains advisories for updates and apply patches once released. Until then, restrict access to the YouTrack Helpdesk component and consider additional authentication controls if possible.
In JetBrains YouTrack before 2025.3.161254, 2026.1.14042 improper authentication in YouTrack Helpdesk allowed unauthenticated account takeover via a… (CVE-2026-86478)
Description
JetBrains YouTrack versions before 2025.3.161254 and 2026.1.14042 contain an improper authentication vulnerability in the YouTrack Helpdesk component. This flaw allows unauthenticated attackers to take over accounts by exploiting a self-asserted email address mechanism. The vulnerability is identified as CVE-2026-86478 and has a critical severity rating with a CVSS score of 9.8.
CVSS v3.1
Score 9.8critical
Affected software
pkg:github/jetbrains/YouTrackRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-86478 is an authentication bypass vulnerability in JetBrains YouTrack Helpdesk prior to versions 2025.3.161254 and 2026.1.14042. The issue arises from improper authentication controls that permit unauthenticated attackers to take over user accounts by leveraging a self-asserted email address. This vulnerability is classified under CWE-290 (Improper Authentication) and has a CVSS v3.1 base score of 9.8, indicating critical impact on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation of this vulnerability allows an unauthenticated attacker to fully compromise user accounts in YouTrack Helpdesk. This leads to complete loss of confidentiality, integrity, and availability of the affected accounts and potentially the broader system depending on account privileges.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Users should monitor JetBrains advisories for updates and apply patches once released. Until then, restrict access to the YouTrack Helpdesk component and consider additional authentication controls if possible.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-w44j-qc22-m82h
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-86478"]
- Ecosystems
- []
- Database Specific Severity
- CRITICAL
- Cvss Version
- 3.1
Threat ID: 6a9f9115acd9273b49ff2bea
Added to database: 09/08/2026, 04:37:41 UTC
Last enriched: 09/08/2026, 04:52:23 UTC
Last updated: 09/08/2026, 07:51:59 UTC
Views: 5
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