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PatchSiren cyber security CVE debrief

CVE-2026-86490 JetBrains CVE debrief

CVE-2026-86490 is a medium-severity vulnerability in JetBrains YouTrack before version 2026.2.18634. The issue allows improper permission checks, enabling overwriting of bundled apps via the app import endpoint. This CVE was published on 2026-09-07T17:17:27.280Z and has not been modified since then. Affected product deployments should be identified in managed environments, and owners should be assigned for follow-up. The CVE record and NVD entry provide limited information about the vulnerability.

Vendor
JetBrains
Product
YouTrack
CVSS
MEDIUM 6.5
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 and administrators of JetBrains YouTrack instances should assess exposure and prioritize verification and potential updates. They should also review compensating controls for exposed systems while remediation is scheduled and verified. Additionally, they should check relevant monitoring, detection, and logs for exposed assets that need extra review. Operators, platform administrators, vulnerability managers

Why it matters

CVE-2026-86490 is a medium-severity vulnerability in JetBrains YouTrack that allows improper permission checks, enabling overwriting of bundled apps. Defenders should prioritize verifying exposure, assessing the need for updates, and adjusting permission checks.

  • Verification of YouTrack instance exposure and app import functionality
  • Potential overwriting of bundled apps
  • Need for updates or compensating controls

Technical summary

The vulnerability, CVE-2026-86490, is caused by improper permission checks in the app import endpoint of JetBrains YouTrack before version 2026.2.18634. This allows overwriting of bundled apps. The CVSS score is 6.5, with a severity of MEDIUM. Defenders should prioritize verifying exposure of YouTrack instances, especially those with app import functionality enabled, and assess the need for updates or compensating controls. Reviewing the supplied official advisory or CVE record is recommended to validate affected scope, severity, and vendor guidance.

Defensive priority

Defenders should prioritize verifying exposure of YouTrack instances, especially those with app import functionality enabled, and assess the need for updates or compensating controls.

Recommended defensive actions

  • Verify YouTrack instance exposure and app import functionality
  • Assess the need for updates to version 2026.2.18634 or later
  • Review and adjust permission checks for app import endpoint

Evidence notes

The CVE record and NVD entry provide limited information about the vulnerability. The vendor, JetBrains, has a reference page for issues fixed in their products.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-86490 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-86490

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

  • CVE-2026-86490 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-86490

    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.