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CVE-2026-86487 JetBrains CVE debrief

CVE-2026-86487 debrief based on CVE Program and NVD records. A crafted WebSocket message allowed read-only whiteboard users to modify canvas content in JetBrains YouTrack before 2026.2.18634. This vulnerability has a CVSS score of 3.1, indicating low severity. Defenders responsible for JetBrains YouTrack instances should assess exposure and verify canvas content modification by read-only whiteboard users. The CVE record was published on 2026-09-07T17:17:26.947Z and has not been modified since then.

Vendor
JetBrains
Product
YouTrack
CVSS
LOW 3.1
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 instances should assess exposure and verify canvas content modification by read-only whiteboard users

Why it matters

CVE-2026-86487 allows read-only whiteboard users to modify canvas content in JetBrains YouTrack before 2026.2.18634. Defenders should assess exposure, verify canvas content modification, and review vendor remediation.

  • Verify canvas content modification by read-only whiteboard users
  • Assess exposure of JetBrains YouTrack instances to CVE-2026-86487
  • Review and apply vendor remediation for JetBrains YouTrack

Technical summary

CVE-2026-86487 is a vulnerability in JetBrains YouTrack before version 2026.2.18634. A crafted WebSocket message allowed read-only whiteboard users to modify canvas content. The CVSS score is 3.1, indicating a low severity vulnerability. This issue was reported and addressed by JetBrains. Defenders should assess exposure and verify canvas content modification by read-only whiteboard users.

Defensive priority

Assess exposure and verify canvas content modification

Recommended defensive actions

  • Assess exposure of JetBrains YouTrack instances to CVE-2026-86487
  • Verify canvas content modification by read-only whiteboard users
  • Review and apply vendor remediation for JetBrains YouTrack

Evidence notes

CVE Program and NVD records indicate a crafted WebSocket message allowed read-only whiteboard users to modify canvas content in JetBrains YouTrack before 2026.2.18634

Sources and references

Verified primary and authoritative sources

  • CVE-2026-86487 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-86487

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

  • CVE-2026-86487 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-86487

    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.