CVE-2026-86494Network attack vector

Unauthorized issue-link changes via whiteboard cloning

Published Sep 7, 2026 · Updated Sep 8, 2026

Improper authorization in JetBrains YouTrack before 2026.2.18634 allows remote authenticated users to alter links on inaccessible issues. The whiteboard-cloning workflow applies link changes to issues the requesting user cannot access; JetBrains has not disclosed the responsible handler or omitted authorization check. A low-privileged account that can clone a whiteboard is sufficient, and the resulting integrity impact is limited to links on otherwise inaccessible issues.

CVSS severity7.7
High
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in JetBrains YouTrack before 2026.2.18634 allows remote authenticated users to alter links on inaccessible issues. The whiteboard-cloning workflow applies link changes to issues the requesting user cannot access; JetBrains has not disclosed the responsible handler or omitted authorization check. A low-privileged account that can clone a whiteboard is sufficient, and the resulting integrity impact is limited to links on otherwise inaccessible issues.

The record

CVE
CVE-2026-86494
Published
Sep 7, 2026
Updated
Sep 8, 2026
Vendor
JetBrains
Product
YouTrack
Classifications
CWE-862, T1565.001
Attack vector
network
Privileges
authenticated

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 <2026.2.18634

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

JetBrains · YouTrackversion=0 <2026.2.18634

Published CVSS scores

7.7JetBrainsCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1565.001Stored Data Manipulation

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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