Next.js next/script beforeInteractive XSS
CVE-2026-44580 is a cross-site scripting vulnerability in Next.js affecting versions 13.0.0 through before 15.5.16 and before 16.2.5. The issue occurs in applications that use next/script with the beforeInteractive strategy together with untrusted content. In affected versions, serialized script content was not safely escaped before being embedded into the HTML document. As a result, attacker-controlled input could break out of the intended inline script context and cause arbitrary JavaScript to execute in the victim's browser. The issue is tracked as GHSA-gx5p-jg67-6x7h and was fixed by changing Next.js to safely escape serialized beforeInteractive script content before embedding it into the page.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
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Remediation
Patch, then assume compromise.
Exploits
No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
3 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.