CVE-2025-4144: cloudflare workers-oauth-provider

csirt@kutim:~/threat-intel/cve/CVE-2025-4144

CVSS 9.8 · Critical EPSS 0,57%

Kerentanan Improper Authentication pada cloudflare workers-oauth-provider. Skor CVSS 3.1 9.8 (Critical) menurut NVD.

Deskripsi (NVD)

PKCE was implemented in the OAuth implementation in workers-oauth-provider that is part of MCP framework https://github.com/cloudflare/workers-mcp . However, it was found that an attacker could cause the check to be skipped. Fixed in: https://github.com/cloudflare/workers-oauth-provider/pull/27 https://github.com/cloudflare/workers-oauth-provider/pull/27 Impact: PKCE is a defense-in-depth mechanism against certain kinds of attacks and was an optional extension in OAuth 2.0 which became required in the OAuth 2.1 draft. (Note that the MCP specification requires OAuth 2.1.). This bug completely bypasses PKCE protection.

Rincian

Terbit di NVD: 1 Mei 2025
Terakhir diubah: 17 Juni 2026
Status NVD: Analyzed
CVSS 3.1: 9.8 (Critical), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H · uraikan di kalkulator
Jenis kelemahan (CWE): CWE-287: Improper Authentication
EPSS (30 hari): 0,57% peluang dieksploitasi; lebih tinggi dari 45,8% CVE lain

Produk dan versi terdampak

Vendor	Produk	Versi terdampak
cloudflare	workers-oauth-provider	Versi 0.0.5

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

https://github.com/cloudflare/workers-oauth-provider/pull/27 issue tracking · patch

Sumber: NVD · CVE.org · EPSS. Halaman ini disusun otomatis dari data tersebut; pembaruan terakhir 5 Okt 2026, 20:11 WITA. Kalau sistem di Perangkat Daerah memakai produk ini dan butuh bantuan, laporkan lewat kanal pelaporan.