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CVE-2026-86492 JetBrains CVE debrief

CVE-2026-86492 debrief based on the supplied source corpus. The vulnerability is a high-severity issue in JetBrains YouTrack before 2026.2.18634, allowing cross-tenant theft of GitHub App installation tokens due to a shared token cache issue. This could lead to potential token theft and cross-tenant access risks in shared YouTrack environments. Defenders responsible for YouTrack deployments, especially those using shared token caches or integrating with GitHub Apps, should assess exposure and prioritize verification and potential updates. The CVE record and NVD entry indicate a CVSS score of 8.5, emphasizing the need for verification of YouTrack deployment versions and GitHub App

Vendor
JetBrains
Product
YouTrack
CVSS
HIGH 8.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-07
Original CVE updated
2026-09-07
Advisory published
2026-09-07
Advisory updated
2026-09-07

Who should care

Defenders responsible for JetBrains YouTrack deployments, especially those using shared token caches or integrating with GitHub Apps, should assess exposure and prioritize verification and potential updates.

Why it matters

CVE-2026-86492 is a high-severity vulnerability in JetBrains YouTrack that allows cross-tenant theft of GitHub App installation tokens due to a shared token cache issue. Defenders responsible for YouTrack deployments should assess exposure, prioritize verification, and consider updates or compensating controls. The vulnerability's impact is primarily related to potential token theft and cross-tenant access risks.

  • Potential theft of GitHub App installation tokens
  • Cross-tenant access risks in shared YouTrack environments
  • Need for verification of YouTrack deployment versions and configurations
  • Possible impact on GitHub App integrations with YouTrack

Technical summary

CVE-2026-86492 is a high-severity vulnerability in JetBrains YouTrack before 2026.2.18634. A shared token cache issue allows for cross-tenant theft of GitHub App installation tokens. The vulnerability has a CVSS score of 8.5 and is considered high severity.

Defensive priority

Defenders should prioritize verifying exposure in their YouTrack deployments, especially those with shared token caches, and assess the need for updates or compensating controls.

Recommended defensive actions

  • Verify YouTrack deployment version and check for updates to 2026.2.18634 or later
  • Assess exposure of shared token caches in YouTrack deployments
  • Consider implementing compensating controls for GitHub App installation token management

Evidence notes

The CVE record and NVD entry indicate a high-severity vulnerability in JetBrains YouTrack before 2026.2.18634, allowing cross-tenant theft of GitHub App installation tokens due to a shared token cache issue.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-86492 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-86492

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-86492 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-86492

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.