A critical authentication bypass vulnerability (CVE-2026-62422) has been disclosed in JetBrains YouTrack versions 2026.1.13757 and earlier, including 2025.3.148033, 2025.2.148048, 2025.1.148120, 2024.3.148430, and 2024.2.148429. The flaw enables attackers with direct database access to bypass authentication mechanisms and gain administrative privileges. This vulnerability carries a CVSS score of 10.0, indicating the highest severity level. All instances of YouTrack running affected versions are at risk of immediate compromise. Attackers could exploit this to modify system configurations, exfiltrate sensitive data, or deploy malicious payloads. Immediate remediation requires upgrading to YouTrack 2026.1.13757 or later. Organizations should prioritize patching and restrict database access to trusted systems until updates are applied. No temporary workarounds are available for this critical issue. The vulnerability underscores the importance of maintaining up-to-date software in environments where database-level access cannot be strictly controlled.