What is CVE-2026-2747?

CVE-2026-2747 is a high-severity vulnerability in Seppmail Secure Email Gateway, classified under Information Disclosure. CVSS score: 7.5/10. Published 2026-03-04.

How severe is CVE-2026-2747?

High severity. CVSS v3 base score is 7.5 out of 10.

Information disclosure in Seppmail Secure Email Gateway

CVE-2026-2747

SEPPmail Secure Email Gateway before version 15.0.1 decrypts inline PGP messages without isolating them from surrounding unencrypted content, allowing exposure of sensitive information to an unauthorized actor.

Vulnerability class: Information Disclosure

EPSS: 0.003 (16.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Seppmail Secure Email Gateway — versions 0
Seppmail

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

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

Frequently asked questions

What is CVE-2026-2747?: CVE-2026-2747 is a high-severity vulnerability in Seppmail Secure Email Gateway, classified under Information Disclosure. CVSS score: 7.5/10. Published 2026-03-04.
How severe is CVE-2026-2747?: High severity. CVSS v3 base score is 7.5 out of 10.