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PatchSiren cyber security CVE debrief

CVE-2026-86493 JetBrains CVE debrief

CVE-2026-86493 debrief based on CVE Program and NVD records. The vulnerability affects JetBrains YouTrack before version 2026.2.18634, allowing read-only users to create and modify whiteboard cards due to improper permission checks. This issue has a CVSS score of 6.5 and is classified as MEDIUM severity. Defenders and administrators of JetBrains YouTrack instances should assess exposure and verify remediation to prevent potential exploitation. The CVE record was published on 2026-09-07T17:17:27.627Z and has not been modified since then.

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 verify remediation. This includes reviewing user permissions, whiteboard card modifications, and ensuring the system is updated to version 2026.2.18634 or later if vulnerable. Security teams and vulnerability management teams should also review the CVE record and NVD entry for further details and guidance on mitigation and remedi

Why it matters

CVE-2026-86493 allows read-only users to create and modify whiteboard cards in JetBrains YouTrack before 2026.2.18634. Defenders and administrators should assess exposure, verify remediation, and remediate to version 2026.2.18634 or later if vulnerable.

  • Verify read-only user permissions and whiteboard card modifications
  • Remediate to version 2026.2.18634 or later if vulnerable
  • Assess exposure of JetBrains YouTrack instances

Technical summary

CVE-2026-86493: JetBrains YouTrack before 2026.2.18634 had improper permission checks that allowed read-only users to create and modify whiteboard cards. This vulnerability has a CVSS score of 6.5 and is considered MEDIUM severity. The issue was reported and publicly disclosed on 2026-09-07T17:17:27.627Z. Affected users should update to version 2026.2.18634 or later to mitigate the vulnerability.

Defensive priority

Assess exposure and verify remediation for JetBrains YouTrack instances

Recommended defensive actions

  • Verify JetBrains YouTrack instances for exposure
  • Assess read-only user permissions and whiteboard card modifications
  • Remediate to version 2026.2.18634 or later if vulnerable

Evidence notes

The CVE record and NVD entry indicate improper permission checks in JetBrains YouTrack before 2026.2.18634 allowed read-only users to create and modify whiteboard cards.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-86493 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-86493

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

  • CVE-2026-86493 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-86493

    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.