CVE-2026-49368Network attack vector

Stored script execution through notification templates

Published May 29, 2026 · Updated May 29, 2026

Stored XSS in JetBrains YouTrack before 2026.1.13162 allows remote authenticated users to execute script through project notification templates. JetBrains identifies the affected locus as project notification templates but has not published the rendering or sanitization failure that permits stored script content. Low-privileged access and recipient interaction are required; successful execution can read or alter data accessible in the recipient's browser session.

CVSS severity8.7
High
EPSS probability0.21%
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 2026.1.13162 allows remote authenticated users to execute script through project notification templates. JetBrains identifies the affected locus as project notification templates but has not published the rendering or sanitization failure that permits stored script content. Low-privileged access and recipient interaction are required; successful execution can read or alter data accessible in the recipient's browser session.

The record

CVE
CVE-2026-49368
Published
May 29, 2026
Updated
May 29, 2026
Vendor
JetBrains
Product
YouTrack
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 29, 2026CVE publishedPublication date reported by the CVE source.
  2. May 29, 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 <2026.1.13162

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

JetBrains · YouTrackversion=0 <2026.1.13162

Published CVSS scores

8.7JetBrains s.r.o.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/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/JScript

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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