How severe is CVE-2026-44581?

CVE-2026-44581 has a CVSS 3.x base score of 4.7, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-44581 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-44581?

CVE-2026-44581 affects Vercel Next.js. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-44581?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-44581 have an EU (EUVD) identifier?

Yes. CVE-2026-44581 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30083.

When was CVE-2026-44581 published?

CVE-2026-44581 was published on 2026-05-13 and last updated on 2026-06-17.

CVE-2026-44581

CVE-2026-44581 is a medium-severity vulnerability in Vercel Next.js with a CVSS 3.x base score of 4.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 4.7)
EPSS exploit prediction: 0% (13th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-30083
Weakness: CWE-79
Affected product: Vercel Next.js
Published: 2026-05-13
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-44581?: 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.
How severe is CVE-2026-44581?: CVE-2026-44581 has a CVSS 3.x base score of 4.7, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-44581 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-44581?: CVE-2026-44581 affects Vercel Next.js. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-44581?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-44581 have an EU (EUVD) identifier?: Yes. CVE-2026-44581 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30083.
When was CVE-2026-44581 published?: CVE-2026-44581 was published on 2026-05-13 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:vercel:next.js:*:*:*:*:*:node.js:*:*

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