[UPDATE] [high] Vercel Next.js: Multiple vulnerabilities

CSIRTS triage

What

An attacker can exploit multiple vulnerabilities in Vercel Next.js to bypass security precautions, conduct cross-site scripting attacks, manipulate data, disclose confidential information, or cause a denial-of-service condition.

Who is affected

Deployments of Next.js are affected.

Urgency

Remediation is urgent due to the high severity and multiple attack vectors.

Action

Update to the latest version of Next.js to mitigate these vulnerabilities.

AI-assisted analysis generated from the source advisory — verify against the original.

Details

Source

CERT-Bund (BSI) Security Advisories (DE · national-cert · site)

Severity

high

Published

2026-08-13

Exploitation

Not in CISA KEV at last sync

Language

Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-1401

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

• Moderate exploitation riskCVE-2026-238701.5% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 73% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-445720.28% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 20% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-445730.62% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 47% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-445740.64% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 48% of all EPSS-scored CVEs.
• Moderate exploitation riskCVE-2026-445751.6% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 74% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-445760.29% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 21% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-445770.74% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 52% of all EPSS-scored CVEs.
• Elevated exploitation riskCVE-2026-4457838.9% 30-day exploitation probability — well above the norm. Schedule remediation this cycle. Riskier than 98% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-445790.75% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 52% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-445800.21% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 10% of all EPSS-scored CVEs.

Referenced CVEs

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

• unknownMultiple vulnerabilities in IBM products (July 17, 2026)cert-fr-avis

Recent advisories for Vercel Next.js

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

• high[NEW] [high] Vercel Next.js: Multiple Vulnerabilitiescert-bund · 2026-08-13
• medium[UPDATE] [medium] Vercel Next.js: Multiple vulnerabilities allow denial of servicecert-bund · 2026-07-02
• medium[UPDATE] [medium] Vercel Next.js: Multiple vulnerabilitiescert-bund · 2026-07-02

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