# CVE-2026-44581: Next.js: Cross-site scripting in App Router applications using CSP nonces

> CVE-2026-44581: Next.js: Cross-site scripting in App Router applications using CSP nonces. CVSS 4.7 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-44581
Last updated: 2026-06-17T10:50:49Z

- Published: 2026-05-13 17:07 UTC · Updated: 2026-06-17 10:50 UTC · Assigner: GitHub\_M
- CVSS: 4.7 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
- EPSS: 0.22%, 13th 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 13.4.0 to before 15.5.16 and 16.2.5, App Router applications that rely on CSP nonces can be vulnerable to stored cross-site scripting when deployed behind shared caches. In affected versions, malformed nonce values derived from request headers could be reflected into rendered HTML in an unsafe way, allowing an attacker to poison cached responses and cause script execution for later visitors. 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-2026-44581)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-44581)
- [https://github.com/vercel/next.js/security/advisories/GHSA-ffhc-5mcf-pf4q](https://github.com/vercel/next.js/security/advisories/GHSA-ffhc-5mcf-pf4q)

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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-2026-44581 · Markdown: https://rewindex.com/cve/CVE-2026-44581.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-44581 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:01:47.677Z