CVE-2026-103493: In JetBrains YouTrack before 2026.2.19422 stored XSS via Mermaid and LaTeX content was possible

Q: How do I fix CVE-2026-103493?

youtrack: upgrade to 2026.2.19422. Exact commands for each OS are on this page.

Q: Is CVE-2026-103493 being exploited?

CVE-2026-103493 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-2026-103493 affect?

CVE-2026-103493 affects youtrack. Severity is high (CVSS 8.1). In JetBrains YouTrack before 2026.2.19422 stored XSS via Mermaid and LaTeX content was possible

Routine

HIGH 8.1UPGRADE

CVE-2026-103493 is a high-severity flaw (CVSS 8.1) affecting youtrack. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In JetBrains YouTrack before 2026.2.19422 stored XSS via Mermaid and LaTeX content was possible

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 87%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-10-01
Last modified	2026-10-01

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

Last updated 2026-10-01 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-01 10:17 UTCPublished CVE record published
2026-10-01 16:17 UTCUpdated Record last modified

jetbrains youtrack UPGRADE

Affected: < 2026.2.19422

Fixed in: 2026.2.19422

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 2026.2.19422 (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-2026-103493?

youtrack: upgrade to 2026.2.19422. Exact commands for each OS are on this page.

Is CVE-2026-103493 being exploited?

CVE-2026-103493 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-2026-103493 affect?

CVE-2026-103493 affects youtrack. Severity is high (CVSS 8.1). In JetBrains YouTrack before 2026.2.19422 stored XSS via Mermaid and LaTeX content was possible

How urgent is CVE-2026-103493?

Priority 31/100. High severity

Related CVEs

CVE-2026-33392 HIGH 7.2 UPGRADE In JetBrains YouTrack before 2025.3.131383 high privileged user can achieve RCE via sandbox bypass
CVE-2026-57923 MEDIUM 5.3 UPGRADE In JetBrains YouTrack before 2026.2.16593 improper authorisation in the app configurations endpoint allowed mo
CVE-2026-57921 MEDIUM 4.3 UPGRADE In JetBrains YouTrack before 2026.2.16593 improper access control allowed reading users' private data via the
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

References

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