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CVE-2026-44581

Next.js: Cross-site scripting in App Router applications using CSP nonces

Published: May 13, 2026Updated: May 14, 2026 Sources: CVE List NVD BDUCWE-79
4.7MEDIUM
NVD MITRE
EPSS Score
0.2%
Top 87.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:RS:CC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-79

Affected Products

next.jsvercel
LibraryLibrary
OSS Libraries / web-framework
Next.jsVercel
LibraryLibrary
OSS Libraries / web-framework
vercelcommercialUSOSS Librariesaka vercel

Exploitability

Official Patch Available
Workaround Available

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

https://github.com/vercel/next.js/security/advisories/GHSA-ffhc-5mcf-pf4q
github.com
https://github.com/vercel/next.js/security/advisories/GHSA-ffhc-5mcf-pf4q
github.com
https://github.com/dwisiswant0/next-16.2.4-pocs
github.com

Timeline

Published
May 13, 2026
Last Updated
May 14, 2026

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