CVE-2026-86497Network attack vector

Mailbox credential disclosure via missing re-authentication

Published Sep 7, 2026 · Updated Sep 8, 2026

Information disclosure in JetBrains YouTrack before 2026.2.18769 allows remote authenticated users to exfiltrate stored mailbox credentials. The mailbox configuration flow accepts a changed host without re-authenticating the stored mailbox account, enabling the new host to receive its credentials. Project-administrator access is required, and the reported consequence is limited to disclosure of the configured mailbox credentials.

CVSS severity6.8
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in JetBrains YouTrack before 2026.2.18769 allows remote authenticated users to exfiltrate stored mailbox credentials. The mailbox configuration flow accepts a changed host without re-authenticating the stored mailbox account, enabling the new host to receive its credentials. Project-administrator access is required, and the reported consequence is limited to disclosure of the configured mailbox credentials.

The record

CVE
CVE-2026-86497
Published
Sep 7, 2026
Updated
Sep 8, 2026
Vendor
JetBrains
Product
YouTrack
Classifications
CWE-201, T1555
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Sep 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2026.2.18769

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

JetBrains · YouTrackversion=0 <2026.2.18769

Published CVSS scores

6.8JetBrainsCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-201Insertion of Sensitive Information Into Sent Data
T1555Credentials from Password Stores

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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