CVE-2021-23393: flask unchained project flask unchained

csirt@kutim:~/threat-intel/cve/CVE-2021-23393

CVSS 5.4 · Medium EPSS 0,72%

Kerentanan URL Redirection to Untrusted Site ('Open Redirect') pada flask unchained project flask unchained. Skor CVSS 3.1 5.4 (Medium) menurut NVD.

Deskripsi (NVD)

This affects the package Flask-Unchained before 0.9.0. When using the the _validate_redirect_url function, it is possible to bypass URL validation and redirect a user to an arbitrary URL by providing multiple back slashes such as \\\evil.com/path. This vulnerability is only exploitable if an alternative WSGI server other than Werkzeug is used, or the default behaviour of Werkzeug is modified using 'autocorrect_location_header=False.

Rincian

Terbit di NVD: 11 Juni 2021
Terakhir diubah: 17 Juni 2026
Status NVD: Modified
CVSS 3.1: 5.4 (Medium), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N · uraikan di kalkulator
Jenis kelemahan (CWE): CWE-601: URL Redirection to Untrusted Site ('Open Redirect')
EPSS (30 hari): 0,72% peluang dieksploitasi; lebih tinggi dari 52,5% CVE lain

Produk dan versi terdampak

Vendor	Produk	Versi terdampak
flask unchained project	flask unchained	Semua versi sebelum 0.9.0

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

https://github.com/briancappello/flask-unchained/commit/71e36b28166f9ffbe0a991f51127f0984f7e6a40 patch · advisory pihak ketiga
https://snyk.io/vuln/SNYK-PYTHON-FLASKUNCHAINED-1293189 patch · advisory pihak ketiga

Sumber: NVD · CVE.org · EPSS. Halaman ini disusun otomatis dari data tersebut; pembaruan terakhir 5 Okt 2026, 20:10 WITA. Kalau sistem di Perangkat Daerah memakai produk ini dan butuh bantuan, laporkan lewat kanal pelaporan.