CVE-2026-127121: Alinto sogo · Improper Verification of Cryptographic Signature
Affects Alinto sogoSource CVE Database V5
Not known to be exploited · CVSS 7.1 High : upgrade to 5.12.13 soon.
Data as of 12 Nov 2026, 16:07 UTC
Thin evidence
One scorer or none| CNA (VulnCheck) | CVSS 4.0 | 7.1 |
|---|---|---|
| CNA (VulnCheck) | CVSS 3.1 | 6.5 |
- Patch
- Available – fixed in 5.12.13
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:NExploitation evidence
Disclosed: evidence found.
CVE published 12 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 12 Nov 2026.
What to do
Upgrade Alinto sogo to 5.12.13.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Alintosogo | Affected
| Fixed in
|
GitHubsogopkg:github/sogoOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A fix is available in SOGo version 5.12.13. Users and administrators should upgrade to version 5.12.13 or later to remediate this vulnerability. No additional mitigations are indicated by the vendor advisory.
Description
SOGo versions before 5.12.13 have a vulnerability in cryptographic signature verification 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 impersonated From address, attackers can inject a self-signed certificate into the victim's contact card. This flaw enables attackers to decrypt subsequent encrypted communications intended for the victim.