CVE-2026-86497

Exfiltration of Mailbox Credentials by Project Administrator in JetBrains YouTrack

Published Sep 7, 2026 CVSS 3.1 · 6.8 Medium EPSS < 1% KEV · Not listed

Description

In JetBrains YouTrack before 2026.2.18769 changing a mailbox host without re-authentication allowed a project administrator to exfiltrate stored mailbox credentials

Analysis

Technical impact

JetBrains YouTrack versions prior to 2026.2.18769 allow a project administrator to change a mailbox host without re‑authentication. This flaw enables the administrator to exfiltrate the stored mailbox credentials, exposing sensitive account information. The vulnerability is an information exposure flaw identified as CWE‑201.

Affected Systems

JetBrains YouTrack before 2026.2.18769 is affected. The issue applies to all instances of YouTrack where mailbox integration is configured and used by project administrators.

Risk and Exploitability

The flaw carries a CVSS score of 6.8, indicating a moderate severity. EPSS data is not available, and the vulnerability is not listed in the CISA KEV catalog. Exfiltration is limited to users with project administrator privileges; no external attacker can exploit the flaw directly. The most likely attack vector involves an internal user with appropriate permissions changing the mailbox host and reading the credentials that were stored in the system.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

JetBrains

YouTrack

unaffected

Version	Status	Constraints
`0`	affected	< 2026.2.18769

No data.

Vendor Product Versions

Jetbrains

Youtrack

Version	Status	Scheme	Platform
`[0,2026.2.18769)`	affected	generic	—

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Upgrade JetBrains YouTrack to version 2026.2.18769 or later, which contains the fix for this issue.
If an upgrade is delayed, restrict project administrator privileges or disable the mailbox integration feature to block potential credential exposure.
Review system logs for unauthorized mailbox host changes and monitor for anomalous credential access patterns.

Generated by OpenCVE AI on September 7, 2026 at 17:23 UTC.

Tracking

Advisories

No advisories available

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required High

Scope Changed

Confidentiality Impact High

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.513% probability within 30 days)

Exploitation none

Automatable no

Technical Impact partial

References

Link	Providers
https://www.jetbrains.com/privacy-security/issues-fixed/

History

Sep 8, 2026 11:30 AM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Sep 7, 2026 6:00 PM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Jetbrains Jetbrains youtrack
Vendors & Products		Jetbrains Jetbrains youtrack

Sep 7, 2026 5:45 PM Title updated View changes

Type	Values Removed	Values Added
Title		Exfiltration of Mailbox Credentials by Project Administrator in JetBrains YouTrack

Sep 7, 2026 4:45 PM Description updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		In JetBrains YouTrack before 2026.2.18769 changing a mailbox host without re-authentication allowed a project administrator to exfiltrate stored mailbox credentials
Weaknesses		CWE-201
References		https://www.jetbrains.com/privacy-security/issues-fixed/
Metrics		cvssV3_1 `{'score': 6.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N'}`