Cross-site scripting in beforeInteractive scripts with untrusted input (CVE-2026-44580) | HOL Guard CVE

Medium severityCVE-2026-44580GHSA-GX5P-JG67-6X7H

Cross-site scripting in beforeInteractive scripts with untrusted input

Answer in brief

CVE-2026-44580 records a Medium severity vulnerability in Cross-site scripting in beforeInteractive scripts with untrusted input. The current sources do not mark it as known exploited. The current feed maps next (npm), next (npm). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

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

Published May 6, 2026Updated May 7, 2026Source checked Aug 26, 2026First seen by HOL Aug 25, 2026Material review May 7, 2026

Upstream Advisory

Key facts

Risk: Medium
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Not reported

Why this deserves its current priority

A CVSS score is not reported in the current record. 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 next (npm), next (npm). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
nextnpm	>=13.0.0<15.5.16	Not reported
nextnpm	>=16.0.0<16.2.5	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for next, next.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
May 6, 2026
Evidence: source:ghsa:source_dates:source-dates:record
Source modified
May 7, 2026
Evidence: source:ghsa:source_dates:source-dates:record
First seen by HOL
Aug 25, 2026

Sources and claim methodology

GitHub security advisorygithub.com

Upstream source description

### Impact Applications that use `beforeInteractive` scripts together with untrusted content can be vulnerable to cross-site scripting. In affected versions, serialized script content was not escaped safely before being embedded into the document, which could allow attacker-controlled input to break out of the intended script context and execute arbitrary JavaScript in a visitor's browser. ### Fix We now HTML-escape serialized `beforeInteractive` script content before embedding it into the page, preventing attacker-controlled content from breaking out of the inline script boundary. ### Workarounds If you cannot upgrade immediately, do not pass untrusted data into `beforeInteractive` scripts. If that pattern is unavoidable, sanitize or escape the content before embedding it.

Quoted source text, attributed separately from HOL analysis.