CVE-2026-86484Network attack vector

Stored XSS via assignee-name template injection

Published Sep 7, 2026 · Updated Sep 8, 2026

Stored XSS in JetBrains YouTrack before 2026.2.18634 allows remote authenticated users to execute script through assignee names. The assignee-name rendering path passes attacker-controlled AngularJS template expressions into client-side template evaluation instead of treating the name as inert text. An authenticated account must place the crafted name where another user views the affected assignee display, allowing script execution in that viewer's YouTrack origin.

CVSS severity4.6
Medium
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in JetBrains YouTrack before 2026.2.18634 allows remote authenticated users to execute script through assignee names. The assignee-name rendering path passes attacker-controlled AngularJS template expressions into client-side template evaluation instead of treating the name as inert text. An authenticated account must place the crafted name where another user views the affected assignee display, allowing script execution in that viewer's YouTrack origin.

The record

CVE
CVE-2026-86484
Published
Sep 7, 2026
Updated
Sep 8, 2026
Vendor
JetBrains
Product
YouTrack
Classifications
CWE-79, T1059.007
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

4.6JetBrainsCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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