CVE-2026-64810 JetBrains CVE debrief

Who should care

Users of JetBrains IntelliJ IDEA versions before 2026.2, security teams monitoring for potential user activity tracking, and administrators of affected systems should review and apply vendor advisories for mitigation. They should also monitor for suspicious user activity and be aware of the vulnerability's potential impact on their systems and user activity tracking concerns. Limited details are available on exploitation or affected scope, emphasizing the need for caution and review of official advisories and CVE records for further information and mitigation guidance. This vulnerability could have implications for user activity tracking and monitoring within affected environments, requiring a review of compensating controls and exposure assessment for potentially affected systems and user activity tracking concerns. Limited details are available on exploitation or affected scope, emphasizing the need for caution and review of official advisories and CVE records for further information and mitigation guidance. This vulnerability could have implications for user activity tracking and monitoring within affected environments, requiring a review of compensating controls and exposure assessment for potentially affected systems and user activity tracking concerns. Limited details are available on exploitation or affected scope, emphasizing the need for caution and review of official advisories and CVE records for further information and mitigation guidance. This vulnerability could have implications for user activity tracking and monitoring within affected environments, requiring a review of compensating controls and exposure assessment for potentially affected systems and user activity tracking concerns. Limited details are available on exploitation or affected scope, emphasizing the need for caution and review of official advisories and CVE records for further information and mitigation guidance. This vulnerability could have implications for user activity tracking and monitoring within affected environments, requiring a review of compensating controls and exposure assessment for potentially affected systems and user activity tracking concerns. Limited details are 7

Technical summary

The HTML injection vulnerability in JetBrains IntelliJ IDEA before 2026.2 could allow silent user activity tracking through IDE notifications. This vulnerability has a CVSS score of 4.3 and is classified as MEDIUM severity. Affected users should review and apply vendor advisories for mitigation. Security teams should monitor for potential user activity tracking, and administrators should be aware of the vulnerability in their systems.

Defensive priority

Medium-priority defensive review recommended due to potential for user activity tracking.

Recommended defensive actions

• Review and apply vendor advisory for mitigation
• Inventory checks for IntelliJ IDEA versions before 2026.2
• Monitoring for suspicious user activity

Evidence notes

Evidence from official CVE and NVD sources indicates HTML injection in JetBrains IntelliJ IDEA before 2026.2, allowing silent user activity tracking. Limited details on exploitation or affected scope.

Sources and 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.