CVE-2026-86486
Received Received - Intake

JetBrains YouTrack Blank VCS Webhook Handler Bypass

Publication date: 2026-09-07

Last updated on: 2026-09-07

Assigner: JetBrains s.r.o.

Description
In JetBrains YouTrack before 2026.2.18634 the generic VCS webhook handler failed open when its secret was blank

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Meta Information

Published
2026-09-07
Last Modified
2026-09-07
Generated
2026-09-07
AI Q&A
2026-09-07
EPSS Evaluated
N/A
NVD
CVE-2026-86486
EUVD
EUVD-2026-72502

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
jetbrains youtrack to 2026.2.18634 (exc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-306 The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.

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Executive Summary

In JetBrains YouTrack before version 2026.2.18634, there is a vulnerability where the generic VCS webhook handler fails to properly validate requests when its secret is left blank. This means an attacker could potentially send malicious webhook payloads without needing to know the secret, leading to unauthorized actions being triggered.

Impact Analysis

This vulnerability could allow unauthorized users to trigger webhook actions in your YouTrack instance if the VCS webhook secret is blank. This might lead to unintended changes, data leaks, or service disruptions depending on how webhooks are configured in your system.

Mitigation Strategies

Update JetBrains YouTrack to version 2026.2.18634 or later to address the vulnerability. Ensure VCS webhook secrets are properly configured and not left blank.

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