Critical severity · published Sep 7, 2026
CVE-2026-86478
In JetBrains YouTrack before 2025.3.161254, 2026.1.14042 improper authentication in YouTrack Helpdesk allowed unauthenticated account takeover via a self-asserted email address
9.8
CVSS
0.6%
EPSS
No
On KEV
Description
In JetBrains YouTrack before 2025.3.161254,
2026.1.14042 improper authentication in YouTrack Helpdesk allowed unauthenticated account takeover via a self-asserted email address
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 49% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
YO
YouTrack · JetBrains
before 2025.3.161254,
2026.1.14042 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-86478
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-86478
www.jetbrains.com
https://www.jetbrains.com/privacy-security/issues-fixed/
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