CVE-2025-62800: jlowin fastmcp

csirt@kutim:~/threat-intel/cve/CVE-2025-62800

CVSS 6.1 · Medium EPSS 0,28%

Kerentanan Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') pada jlowin fastmcp. Skor CVSS 3.1 6.1 (Medium) menurut NVD.

Deskripsi (NVD)

FastMCP is the standard framework for building MCP applications. Versions prior to 2.13.0 have a reflected cross-site scripting vulnerability in the OAuth client callback page (oauth_callback.py) where unescaped user-controlled values are inserted into the generated HTML, allowing arbitrary JavaScript execution in the callback server origin. The issue is fixed in version 2.13.0.

Rincian

Terbit di NVD: 28 Oktober 2025
Terakhir diubah: 8 Oktober 2026
Status NVD: Analyzed
CVSS 3.1: 6.1 (Medium), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N · uraikan di kalkulator
Jenis kelemahan (CWE): CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
EPSS (30 hari): 0,28% peluang dieksploitasi; lebih tinggi dari 18,5% CVE lain

Produk dan versi terdampak

Vendor	Produk	Versi terdampak
jlowin	fastmcp	Semua versi sebelum 2.13.0

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

https://github.com/jlowin/fastmcp/security/advisories/GHSA-mxxr-jv3v-6pgc exploit · advisory pihak ketiga

Sumber: NVD · CVE.org · EPSS. Halaman ini disusun otomatis dari data tersebut; pembaruan terakhir 9 Okt 2026, 00:26 WITA. Kalau sistem di Perangkat Daerah memakai produk ini dan butuh bantuan, laporkan lewat kanal pelaporan.