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CVE-2026-103489

LOW 2

Published 2026-10-01 · Last modified 2026-10-01

In JetBrains YouTrack before 2026.2.19422 hTML injection in VCS command failure notifications was possible

NO EXPLOITATION SIGNALS

No known exploitation, public exploit, or elevated probability at this time. Track for changes.

Exploitation likelihood

0.3%chance of exploitation in 30 days · 26th percentile

○ In CISA KEV ○ Public exploit / PoC

Impact if exploited

2CVSS 3.1 · LOW

  • ConfidentialityNone
  • IntegrityLow
  • AvailabilityNone

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ⚠Privileges: Requires an admin / high-privilege account
  • ⚠User interaction: A user must take an action (click / open a file)
  • ⚠Complexity: Needs a race window or specific setup

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept & exploit code

Test against your own equipment

curl -s https://vulnpedia.com/cve/CVE-2026-103489/poc.jsonMachine-readable PoC index for this CVE (for automation).

Listed for defensive triage, patch verification, and authorized testing on systems you own. Machine-readable: /cve/CVE-2026-103489/poc.json

Affected

Vendors Jetbrains

Products Youtrack

Weakness (CWE)

  • CWE-79: Cross-site scripting (XSS)

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:L/A:N

Known Affected Software Configurations

VendorProductVersion range
JetbrainsYoutrack< 2026.2.19422

All CVSS metrics

  • LOW 2 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:L/A:N
  • LOW 2 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:L/A:N
  • MEDIUM 5.4 v3.1 · NVD Primary
    CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

References

Advisories

Sources: NVD · CVE.org · EPSS