PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-86497 JetBrains CVE debrief

A vulnerability in JetBrains YouTrack before 2026.2.18769 allows project administrators to exfiltrate stored mailbox credentials by changing the mailbox host without re-authentication. This issue arises because the software does not require re-authentication when altering mailbox host settings, potentially leading to unauthorized access. Defenders should verify that their YouTrack installations are updated to version 2026.2.18769 or later and ensure that mailbox host changes require re-authentication to prevent credential exfiltration. The vulnerability has a CVSS score of 6.8, indicating medium severity. Further investigation is needed to determine the full scope of affected and  

Vendor
JetBrains
Product
YouTrack
CVSS
MEDIUM 6.8
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 installations should assess exposure and prioritize securing mailbox host changes to prevent credential exfiltration.

Why it matters

Defenders should care about CVE-2026-86497 because it allows project administrators to exfiltrate stored mailbox credentials in JetBrains YouTrack before 2026.2.18769. This vulnerability requires verification of YouTrack installations and securing mailbox host changes to prevent credential exfiltration.

  • Project administrators may be able to exfiltrate stored mailbox credentials
  • Mailbox credential exfiltration could lead to unauthorized access to sensitive information
  • Defenders need to verify and secure YouTrack installations to prevent exploitation

Technical summary

The vulnerability exists in JetBrains YouTrack before version 2026.2.18769. Project administrators can exfiltrate stored mailbox credentials by changing the mailbox host without re-authentication. The CVSS score for this vulnerability is 6.8, indicating a medium severity.

Defensive priority

Defenders should prioritize verifying and securing YouTrack installations, particularly ensuring that mailbox host changes require re-authentication.

Recommended defensive actions

  • Verify YouTrack installations for version 2026.2.18769 or later
  • Ensure mailbox host changes require re-authentication
  • Monitor for suspicious activity related to mailbox credential exfiltration

Evidence notes

The CVE record and NVD entry provide limited information about the vulnerability. Further investigation is needed to determine the full scope of affected versions and potential impact.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-86497 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-86497

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

  • CVE-2026-86497 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-86497

    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.