XSS in Jetbrains Youtrack

CVE-2026-86491

In JetBrains YouTrack before 2026.2.18634 stored XSS was possible via project and organization icon uploads

Vulnerability class: XSS (Cross-Site Scripting)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 3.5 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.002 (14.5th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 14th percentile — 14.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-86491: held from 0.001 to 0.002.

EPSS over last 30 days · oldest: 0.001 · newest: 0.002 · change: +0.001

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-86491?
CVE-2026-86491 is a low-severity vulnerability in Jetbrains Youtrack, classified under Cross-site Scripting. CVSS score: 3.5/10. Published 2026-09-07.
How severe is CVE-2026-86491?
Low severity. CVSS v3 base score is 3.5 out of 10.