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CVE-2026-44581

23
FAUCET Score

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.

First published: May 13, 2026Last modified: May 13, 2026

Impacted Technologies

VendorProductVersion(s)CPE
>= 13.4.0, < 15.5.16CPE matchmatch criteria
cpe:2.3:a:vercel:next.js:*:*:*:*:*:node.js:*:*
>= 16.0.0, < 16.2.5CPE matchmatch criteria
cpe:2.3:a:vercel:next.js:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.1

4.7MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
1.6
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.22%
Probability of exploitation in next 30 days
EPSS Percentile
13.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0022 is in the 27th percentile among its peer group of 707 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.2 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.2 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

npmpatch availablevia ghsa
Product: nextFixed in: 15.5.16
npmpatch availablevia ghsa
Product: nextFixed in: 16.2.5
github_advisoryworkaround availablevia nvd_reference
View patch

Vendor Advisories (1)

npmGHSA-ffhc-5mcf-pf4qmedium

Next.js vulnerable to cross-site scripting in App Router applications using CSP nonces

May 11, 2026

References

github.com / vercel/next.js/security/advisories/GHSA-ffhc-5mcf-pf4q
MitigationVendor Advisory