CVE-2026-27855

Katalog CVE

CVSS 5.9 · Medium EPSS 0,39%

Kerentanan Authentication Bypass by Capture-replay pada dovecot, open-xchange dovecot. Skor CVSS 3.1 5.9 (Medium) menurut NVD.

Deskripsi (NVD)

Dovecot OTP authentication is vulnerable to replay attack under specific conditions. If auth cache is enabled, and username is altered in passdb, then OTP credentials can be cached so that same OTP reply is valid. An attacker able to observe an OTP exchange is able to log in as the user. If authentication happens over unsecure connection, switch to SCRAM protocol. Alternatively ensure the communcations are secured, and if possible switch to OAUTH2 or SCRAM. No publicly available exploits are known.

Rincian

Terbit di NVD

27 Maret 2026

Terakhir diubah

17 Juni 2026

Status NVD

Analyzed

CVSS 3.1

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

Jenis kelemahan (CWE)

CWE-294: Authentication Bypass by Capture-replay

EPSS (30 hari)

0,39% peluang dieksploitasi; lebih tinggi dari 30,7% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json advisory vendor