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MEDIUM severity

CVE-2026-100276 — JetBrains

MEDIUM

CVE-2026-100276 is a medium-severity (CVSS 5.9) CWE-863 vulnerability. No vendor fix is recorded yet; mitigation options are listed below.

In JetBrains YouTrack before 2026.2.19197 guest users could remove a workflow action's visibility restriction and run the action

Published
Sep 30, 2026
Updated
Sep 30, 2026
Affected
1 product
Patched
See advisory
Exploits
None indexed
Exploitation data as of Oct 2, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.2%probability of exploitation in next 30 days
Lower Risk-0.07%
Lower risk than most CVEs11th percentile — riskier than 11% of all scored CVEsHighest risk
0.00%0.26%0.52%0.78%0.3%0.2%Oct 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2026-100276 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 381,682 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Description

In JetBrains YouTrack before 2026.2.19197 guest users could remove a workflow action's visibility restriction and run the action

Affected Products

1 product · 1 configurations
Application
youtrackjetbrains
< 2026.2.19197
range

Detection & mitigation playbook

Vulnerability

  1. Detect

    Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).

  2. Remediation status

    No fixed release is recorded for CVE-2026-100276 yet. Track the upstream advisory, and apply the exposure-reduction steps below in the meantime.

  3. Mitigate without a patch

    Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Frequently Asked Questions

In JetBrains YouTrack before 2026.2.19197 guest users could remove a workflow action's visibility restriction and run the action
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CVE-2026-100276: JetBrains (Medium 5.9) | O3 Security