CVE-2026-100277 JetBrains YouTrack - Authentication Bypass

JetBrains YouTrack < 2026.2.19197 contains an account takeover vulnerability caused by replaying a notification signature, letting attackers take over user accounts, exploit requires replaying a valid notification signature.

CVSS base score 8.9 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.28% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L
Published
30 September 2026
Updated
15 October 2026
Weakness
CWE-863

Vendor fix

Update to version 2026.2.19197 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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