CVE-2026-27824

Katalog CVE

CVSS 5.3 · Medium EPSS 0,19%

Kerentanan Improper Restriction of Excessive Authentication Attempts pada calibre-ebook calibre. Skor CVSS 3.1 5.3 (Medium) menurut NVD.

Deskripsi (NVD)

calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Prior to version 9.4.0, the calibre Content Server's brute-force protection mechanism uses a ban key derived from both `remote_addr` and the `X-Forwarded-For` header. Since the `X-Forwarded-For` header is read directly from the HTTP request without any validation or trusted-proxy configuration, an attacker can bypass IP-based bans by simply changing or adding this header, rendering the brute-force protection completely ineffective. This is particularly dangerous for calibre servers exposed to the internet, where brute-force protection is the primary defense against credential stuffing and password guessing attacks. Version 9.4.0 contains a fix for the issue.

Rincian

Terbit di NVD

27 Februari 2026

Terakhir diubah

17 Juni 2026

Status NVD

Analyzed

CVSS 3.1

5.3 (Medium), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-307: Improper Restriction of Excessive Authentication Attempts
CWE-346: Origin Validation Error

EPSS (30 hari)

0,19% peluang dieksploitasi; lebih tinggi dari 8,1% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://github.com/kovidgoyal/calibre/security/advisories/GHSA-vhxc-r7v8-2xrw exploit · advisory vendor