CVE-2026-127121
SOGo before 5.12.13 S/MIME Certificate Spoofing via UIxMailView
CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-347 |
| Vendor | alinto |
| Product | sogo |
| Published | Nov 12, 2026 |
| Last Updated | Nov 12, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None
Affected Versions
Alinto / sogo
0 < 5.12.13
References
Credits
Richard Olszynský