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PatchSiren cyber security CVE debrief

CVE-2026-86498 JetBrains CVE debrief

CVE-2026-86498 is a high-severity vulnerability in JetBrains YouTrack, allowing modification of linked entities without update permission via PUT requests on link sub-resources. This issue was reported in versions before 2025.3.160480 and 2026.1.14047. The vulnerability impacts systems where unauthorized modifications could occur, emphasizing the need for defenders and administrators to assess exposure and prioritize patching. Reviewing permissions, verifying affected systems, and applying patches are crucial steps.

Vendor
JetBrains
Product
YouTrack
CVSS
HIGH 7.7
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 systems should assess exposure and prioritize patching. This includes reviewing permissions and access controls, verifying affected systems and versions, and applying patches or updates. The vulnerability's impact on security teams and operators requires immediate attention to prevent potential unauthorized modifications of linked entities.

Why it matters

CVE-2026-86498 is a high-severity vulnerability in JetBrains YouTrack that allows modification of linked entities without update permission. Defenders and administrators should assess exposure, prioritize patching, and review permissions.

  • Potential unauthorized modification of linked entities
  • Required verification of affected systems and versions
  • Need for review and update of permissions and access controls

Technical summary

The vulnerability allows modification of linked entities without update permission via PUT requests on link sub-resources in JetBrains YouTrack versions before 2025.3.160480 and 2026.1.14047. This issue arises from insufficient permission checks on link sub-resources, potentially allowing unauthorized modifications. Defenders should focus on verifying affected systems, reviewing permissions, and applying patches or updates.

Defensive priority

Defenders should prioritize verification of affected systems, review permissions, and apply patches.

Recommended defensive actions

  • Verify affected systems and versions
  • Review permissions and access controls
  • Apply patches or updates

Evidence notes

The CVE record and NVD entry provide limited information about the vulnerability. Further verification is required to determine the full scope of affected systems and versions.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-86498 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-86498

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

  • CVE-2026-86498 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-86498

    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.