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VulnerabilityPublished

CVE-2026-127121: Alinto sogo · Improper Verification of Cryptographic Signature

Affects Alinto sogoSource CVE Database V5

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Not known to be exploited · CVSS 7.1 High : upgrade to 5.12.13 soon.

Data as of 12 Nov 2026, 16:07 UTC

CVSS 4.0 base score
7.1High
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (VulnCheck)CVSS 4.07.1
CNA (VulnCheck)CVSS 3.16.5
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:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 12 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
AlintosogoAffected
  • <5.12.13
Fixed in
  • 5.12.13
GitHubsogopkg:github/sogoOther threatsAffected
  • <5.12.13
Fixed in
  • 5.12.13

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.

References

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