# CVE-2026-44580: Next.js: Cross-site scripting in beforeInteractive scripts with untrusted input

> CVE-2026-44580: Next.js: Cross-site scripting in beforeInteractive scripts with untrusted input. CVSS 6.1 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-44580
Last updated: 2026-06-17T10:50:49Z

- Published: 2026-05-13 17:06 UTC · Updated: 2026-06-17 10:50 UTC · Assigner: GitHub\_M
- CVSS: 6.1 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- EPSS: 0.21%, 10th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-79

## Description

Next.js is a React framework for building full-stack web applications. From 13.0.0 to before 15.5.16 and 16.2.5, 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. This vulnerability is fixed in 15.5.16 and 16.2.5.

## Affected vendors and products

- vercel: next.js

## Tracked companies

- [Vercel](https://rewindex.com/company/vercel.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-44580)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-44580)
- [https://github.com/vercel/next.js/security/advisories/GHSA-gx5p-jg67-6x7h](https://github.com/vercel/next.js/security/advisories/GHSA-gx5p-jg67-6x7h)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-44580 · Markdown: https://rewindex.com/cve/CVE-2026-44580.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-44580 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:05:17.124Z