CISA ADP Vulnrichment

Answer in brief

CVE-2026-100263 records a Medium severity (CVSS 4.7) vulnerability in CISA ADP Vulnrichment. The current sources do not mark it as known exploited. The current feed maps JetBrains/YouTrack (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 30, 2026Updated Sep 30, 2026Source checked Sep 30, 2026First seen by HOL Sep 30, 2026Material review Sep 30, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 4.7
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 4.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps JetBrains/YouTrack (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
JetBrains/YouTrackgeneric	>=0 <2026.2.18991	2026.2.18991

Recommended response

Check inventory. Check lockfiles and deployed manifests for JetBrains/YouTrack.
Review the reported fix. Update JetBrains/YouTrack to 2026.2.18991 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 30, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 30, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 30, 2026

Sources and claim methodology

Source referencejetbrains.com

Upstream source description

In JetBrains YouTrack before 2026.2.18991 stored HTML injection via the User-Agent header was possible

Quoted source text, attributed separately from HOL analysis.