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PatchSiren cyber security CVE debrief

CVE-2026-86483 JetBrains CVE debrief

CVE-2026-86483 debrief based on the supplied source corpus. The vulnerability is a medium-severity stored XSS issue in JetBrains YouTrack before version 2026.2.18634, affecting Agile board cards with custom fields. Defenders should assess exposure, verify versions, and monitor for suspicious activity. The CVE record and NVD entry indicate that user interaction is required, and the vulnerability can result in limited confidentiality and integrity impacts. The CVSS score is 5.4, indicating a medium severity. Defenders need to verify exposure in their YouTrack instances, especially those using Agile boards with custom fields, and review custom fields on Agile board cards for potential

Vendor
JetBrains
Product
YouTrack
CVSS
MEDIUM 5.4
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, especially those using Agile boards with custom fields, should assess exposure and verify if their instances are running a vulnerable version.

Why it matters

CVE-2026-86483 is a medium-severity vulnerability in JetBrains YouTrack that allows stored XSS via custom fields on Agile board cards. Defenders responsible for YouTrack instances should assess exposure, verify versions, and monitor for suspicious activity.

  • Defenders need to verify exposure in their YouTrack instances.
  • Instances using Agile boards with custom fields require review for potential XSS vectors.
  • Successful exploitation can result in limited confidentiality and integrity impacts.
  • Defenders should monitor for suspicious activity on YouTrack instances.

Technical summary

The CVE record and NVD entry indicate that JetBrains YouTrack before version 2026.2.18634 is vulnerable to stored XSS via a custom field on Agile board cards. The CVSS score is 5.4, indicating a medium severity. The vulnerability requires user interaction and can result in limited confidentiality and integrity impacts.

Defensive priority

Defenders should prioritize verifying exposure in their YouTrack instances, especially those using Agile boards with custom fields.

Recommended defensive actions

  • Verify YouTrack instance exposure, especially those using Agile boards with custom fields.
  • Check if the instance is running version 2026.2.18634 or later.
  • Review custom fields on Agile board cards for potential XSS vectors.
  • Monitor for suspicious activity on YouTrack instances.

Evidence notes

The CVE record and NVD entry indicate that JetBrains YouTrack before version 2026.2.18634 is vulnerable to stored XSS via a custom field on Agile board cards. The CVSS score is 5.4, indicating a medium severity.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-86483 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-86483

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

  • CVE-2026-86483 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-86483

    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.