What is CVE-2026-27445?

CVE-2026-27445 is a medium-severity vulnerability in Seppmail Secure Email Gateway, classified under Improper Verification of Cryptographic Signature. CVSS score: 5.3/10. Published 2026-03-04.

How severe is CVE-2026-27445?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Seppmail Secure Email Gateway

CVE-2026-27445

SEPPmail Secure Email Gateway before version 15.0.1 does not properly verify that a PGP signature was generated by the expected key, allowing signature spoofing.

EPSS: 0.001 (2.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

Affected products

Seppmail Secure Email Gateway — versions 0
Seppmail

Weakness classification (CWE)

CWE-347 — Improper Verification of Cryptographic Signature

References

vulnerability@ncsc.ch (release-notes, Vendor Advisory)

Frequently asked questions

What is CVE-2026-27445?: CVE-2026-27445 is a medium-severity vulnerability in Seppmail Secure Email Gateway, classified under Improper Verification of Cryptographic Signature. CVSS score: 5.3/10. Published 2026-03-04.
How severe is CVE-2026-27445?: Medium severity. CVSS v3 base score is 5.3 out of 10.