CVE-2026-57921: In JetBrains YouTrack before 2026.2.16593 improper access control allowed reading users' private data via the

Q: How do I fix CVE-2026-57921?

youtrack: upgrade to 2026.2.16593. Exact commands for each OS are on this page.

Q: Is CVE-2026-57921 being exploited?

CVE-2026-57921 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-57921 affect?

CVE-2026-57921 affects youtrack. Severity is medium (CVSS 4.3). In JetBrains YouTrack before 2026.2.16593 improper access control allowed reading users' private data via the comment templates endpoint

Q: How urgent is CVE-2026-57921?

Priority 21/100. No elevated risk signals yet.

Routine

MEDIUM 4.3UPGRADE

CVE-2026-57921 is a medium-severity flaw (CVSS 4.3) affecting youtrack. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In JetBrains YouTrack before 2026.2.16593 improper access control allowed reading users' private data via the comment templates endpoint

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 78%)
CISA exploited list	No
Weakness	CWE-862
Published	2026-06-26
Last modified	2026-10-25

Publisher (CNA): JetBrains s.r.o. · Vendor: jetbrains

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-26 14:17 UTCPublished CVE record published
2026-10-25 22:10 UTCUpdated Record last modified

jetbrains youtrack UPGRADE

Affected: < 2026.2.16593

Fixed in: 2026.2.16593

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy youtrack || rpm -q youtrack || youtrack --version

2. UPGRADE to 2026.2.16593 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade youtrack

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade youtrack

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-57921?

youtrack: upgrade to 2026.2.16593. Exact commands for each OS are on this page.

Is CVE-2026-57921 being exploited?

CVE-2026-57921 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-57921 affect?

CVE-2026-57921 affects youtrack. Severity is medium (CVSS 4.3). In JetBrains YouTrack before 2026.2.16593 improper access control allowed reading users' private data via the comment templates endpoint

How urgent is CVE-2026-57921?

Priority 21/100. No elevated risk signals yet.

Related CVEs

CVE-2026-57923 MEDIUM 5.3 UPGRADE In JetBrains YouTrack before 2026.2.16593 improper authorisation in the app configurations endpoint allowed mo
CVE-2026-57924 MEDIUM 4.3 UPGRADE In JetBrains YouTrack before 2026.2.16593 default role configuration exposed excessive user profile details
CVE-2026-57925 MEDIUM 4.3 UPGRADE In JetBrains YouTrack before 2026.2.16593 improper access control allowed reading saved queries and tags
CVE-2026-57926 LOW 2.6 UPGRADE In JetBrains YouTrack before 2026.2.16593 the websandbox bridge was vulnerable to a prototype pollution attack
CVE-2026-57922 LOW 3.1 UPGRADE In JetBrains YouTrack before 2026.2.16593 project settings disclosure via the MCP was possible

References

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