Next.js is a React framework for building full-stack web applications. Starting in version 1.11.4 and prior to versions 12.3.5, 13.5.9, 14.2.25, and 15.2.3, it is possible to bypass authorization checks within a Next.js application, if the authorization check occurs in middleware. If patching to a safe version is infeasible, it is recommend that you prevent external user requests which contain the x-middleware-subrequest header from reaching your Next.js application. This vulnerability is fixed in 12.3.5, 13.5.9, 14.2.25, and 15.2.3.
{
"cna_assigner": "GitHub_M",
"cwe_ids": [
"CWE-285"
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/29xxx/CVE-2025-29927.json"
}{
"versions": [
{
"introduced": "11.1.4"
},
{
"fixed": "12.3.5"
}
]
}{
"versions": [
{
"introduced": "14.0.0"
},
{
"fixed": "14.2.25"
}
]
}