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CVE-2026-86484 JetBrains CVE debrief

CVE-2026-86484 debrief based on the supplied source corpus. The vulnerability allows stored XSS via angularJS template injection in assignee names in JetBrains YouTrack before 2026.2.18634. Defenders should assess exposure, prioritize verification of user interactions, and update vulnerable deployments. The CVE record and NVD entry indicate a medium-severity vulnerability. An attacker with limited privileges could potentially inject malicious templates, leading to user interaction-based consequences. The debrief is based on the CVE record and NVD entry, which provide details on the vulnerability and its potential impact.

Vendor
JetBrains
Product
YouTrack
CVSS
MEDIUM 4.6
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 should assess exposure and prioritize verification of user interactions and potential data exposure.

Why it matters

CVE-2026-86484 is a medium-severity vulnerability in JetBrains YouTrack before 2026.2.18634, allowing stored XSS via assignee name template injection. Defenders should prioritize verifying exposure, assessing user interaction-based consequences, and updating vulnerable deployments.

  • User interaction-based consequences require verification
  • Potential data exposure through stored XSS
  • Assignee name input validation and sanitization are crucial
  • Successful exploitation depends on user interactions

Technical summary

CVE-2026-86484 is a medium-severity vulnerability in JetBrains YouTrack before 2026.2.18634. The vulnerability allows stored XSS via angularJS template injection in assignee names. An attacker with limited privileges could potentially inject malicious templates, leading to user interaction-based consequences.

Defensive priority

Defenders should prioritize verifying exposure in YouTrack deployments and assessing the impact of stored XSS via assignee name template injection.

Recommended defensive actions

  • Verify YouTrack deployments for exposure to stored XSS via assignee name template injection
  • Assess the impact of successful exploitation on user interactions and potential data exposure
  • Update YouTrack to version 2026.2.18634 or later if vulnerable
  • Monitor user interactions and assignee name inputs for potential malicious activity

Evidence notes

The CVE record and NVD entry indicate a medium-severity vulnerability in JetBrains YouTrack before 2026.2.18634, allowing stored XSS via assignee name template injection.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-86484 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-86484

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

  • CVE-2026-86484 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-86484

    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.