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.

Published 2026-03-04 · last modified 2026-06-17.

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.

EPSS exploit prediction

EPSS: 0.002 (8.2th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 8th percentile — 8.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.001 · newest: 0.002 · change: +0.001

Affected products

Seppmail Secure Email Gateway — versions 0
Seppmail

Weakness classification (CWE)

CWE-347 — Improper Verification of Cryptographic Signature

References

downloads.seppmail.com/extrelnotes/150/ERN15.0.html (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.