CVE-2026-86486
LowCVSS 3.7Exploitation Probability (EPSS)
Low risk6th percentile - higher than 6% of all known CVEs
Summary
In JetBrains YouTrack before 2026.2.18634 the generic VCS webhook handler failed open when its secret was blank.
Risk Assessment
The risk is that an attacker can send fake VCS webhooks without knowing the secret, potentially leading to unauthorized changes in repositories or other actions.
Recommendation
It is recommended to update YouTrack to version 2026.2.18634 or later, which includes a fix enforcing secret validation, and to configure non-empty secrets for webhooks.
Other vulnerabilities in JetBrains YouTrack
See all- CVE-2026-103497Medium
In JetBrains YouTrack before 2026.2.19422, SSRF was possible via the GitHub VCS integration.
- CVE-2026-103496Medium
In JetBrains YouTrack before 2026.2.19422, iDOR in inbox threads allowed reading other users' notifications.
- CVE-2026-103495Medium
In JetBrains YouTrack before 2026.2.19422, missing authorisation allowed reloading of translation catalogs.
- CVE-2026-103493High
In JetBrains YouTrack before 2026.2.19422, stored XSS via Mermaid and LaTeX content was possible. The vulnerability allows execution of arbitrary script in the user's browser.
- CVE-2026-103492Medium
In JetBrains YouTrack before 2026.2.19422, DoS attack was possible via crafted PSD attachments.
- CVE-2026-103491Medium
In JetBrains YouTrack before 2026.2.19422, iDOR in the issue activities API allowed reading restricted issues.
- CVE-2026-86478Critical
In JetBrains YouTrack before 2025.3.161254 and 2026.1.14042, improper authentication in YouTrack Helpdesk allowed unauthenticated account takeover via a self-asserted email address.
- CVE-2026-62422Critical
In JetBrains YouTrack before versions 2026.1.13757, 2025.3.148033, 2025.2.148048, 2025.1.148120, 2024.3.148430, and 2024.2.148429, an authentication bypass via direct database access was possible, leading to administrative access.
- CVE-2026-111092Medium
In JetBrains YouTrack before 2026.2.19575, 2026.3.16075, 2026.3.16397, and 2026.3.16402, mail rules allowed a project admin to execute cross-project issue commands. This violates the isolation of permissions between projects.
- CVE-2026-103494Medium
In JetBrains YouTrack before 2026.2.19422, privilege escalation was possible via user group membership changes.
Original NVD description (English source)
In JetBrains YouTrack before 2026.2.18634 the generic VCS webhook handler failed open when its secret was blank
Vulnerability data from NVD (NIST) · CISA KEV · EPSS