CVE-2026-57921Network attack vector

Authenticated private-data disclosure via comment templates

Published Jun 26, 2026 · Updated Jun 26, 2026

Missing authorization in JetBrains YouTrack before 2026.2.16593 allows remote authenticated users to read private user data through comment templates. The comment templates endpoint returns templates containing another user's private data without enforcing the required access check. A low-privileged account and network access to the endpoint are required, and the demonstrated consequence is limited to unauthorized reading of private data.

CVSS severity4.3
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

Missing authorization in JetBrains YouTrack before 2026.2.16593 allows remote authenticated users to read private user data through comment templates. The comment templates endpoint returns templates containing another user's private data without enforcing the required access check. A low-privileged account and network access to the endpoint are required, and the demonstrated consequence is limited to unauthorized reading of private data.

The record

CVE
CVE-2026-57921
Published
Jun 26, 2026
Updated
Jun 26, 2026
Vendor
JetBrains
Product
YouTrack
Classifications
CWE-862, T1213
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 26, 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 <2026.2.16593

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

JetBrains · YouTrackversion=0 <2026.2.16593

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
4.3JetBrainsCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/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.

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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
T1213Data from Information Repositories

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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