CVE Watch12 nov 2026

CVE-2026-127121

SOGo before 5.12.13 contains an improper cryptographic signature verification vulnerability that allows remote attackers to replace a victim

CVSS

6.5

Medio

EPSS

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KEV

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Exploit Today

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0-100

Publicado: 12 nov 2026 · Última mod.: 12 nov 2026 · CWE-347

EPSS · 30d

Sin historial EPSS suficiente todavía.

Descripción técnica

SOGo before 5.12.13 contains an improper cryptographic signature verification vulnerability that allows remote attackers to replace a victim's contact S/MIME certificate by sending a spoofed multipart/signed message with a mismatched signature and an impersonated From address. Attackers can deliver a crafted CMS signedData object containing their own self-signed certificate, which SOGo's UIxMailView stores on the contact card without validating signature authenticity or certificate identity, enabling subsequent encrypted communications to be decrypted with the attacker's private key.

Referencias oficiales

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