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Vulnerabilities

Vulnerability · CVE-2026-59791

In JetBrains YouTrack before 2026.2.17012 cSS injection via Mermaid diagram rendering was possible

Published Jul 10, 2026 · catalog updated Oct 24, 2026 · In JetBrains YouTrack before

Last checked Oct 25, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-59791. EPSS is 0.23%. Act only if a listed version of In JetBrains YouTrack before is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (In JetBrains YouTrack before).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Low3.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.23%
Remediation
Version ranges on file
Affected products
cpe jetbrains/youtrack

In JetBrains YouTrack before 2026.2.17012 cSS injection via Mermaid diagram rendering was possible

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe jetbrains/youtrack< 2026.2.17012

How to fix CVE-2026-59791

  • Upgrade

    CVE-2026-59791 lists a fix boundary at 2026.2.17012. Compare the installed build with that boundary before you change production.

  • Version check

    Affected < 2026.2.17012

  • Advisory

    Open the cve_org record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-59791. EPSS is 0.23%. Act only if a listed version of In JetBrains YouTrack before is installed.

Which versions are affected?

Compare what you have installed with < 2026.2.17012. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-1021: Improper Restriction of Rendered UI Layers or Frames. EPSS 0.23%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jul 10, 2026 · NIST NVD

    Detected

    In JetBrains YouTrack before 2026.2.17012 cSS injection via Mermaid diagram rendering was possible

  2. Oct 24, 2026 · NIST NVD

    Updated

    In JetBrains YouTrack before 2026.2.17012 cSS injection via Mermaid diagram rendering was possible

Sources

  • CVE.orgVulnerability recordCVE-2026-59791

    Official CVE identifier

    cve.org
  • NIST NVDVulnerability recordCVE-2026-59791

    In JetBrains YouTrack before 2026.2.17012 cSS injection via Mermaid diagram rendering was possible

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 25, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgOct 25, 2026
  • NIST NVDOct 25, 2026