CVE-2026-57926: JetBrains Youtrack

Critical severity, CVSS 9.8. EPSS: 0.3% chance of exploitation in the next 30 days.

In JetBrains YouTrack before 2026.2.16593 the websandbox bridge was vulnerable to a prototype pollution attack

Affected products

• JetBrains Youtrack: before 2026.2.16593 (fixed in 2026.2.16593)

Published 2026-06-26. Last modified 2026-06-27.