What is CVE-2026-29138?

CVE-2026-29138 is a high-severity vulnerability in Seppmail Secure Email Gateway, classified under LDAP Injection. CVSS score: 7.5/10. Published 2026-04-02.

How severe is CVE-2026-29138?

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

LDAP Injection in Seppmail Secure Email Gateway

CVE-2026-29138

SEPPmail Secure Email Gateway before version 15.0.3 allows attackers with a specially crafted email address to claim another user's PGP signature as their own.

EPSS: 0.002 (12.3th 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:N/I:H/A:N.

Affected products

Seppmail Secure Email Gateway — versions 0
Seppmail Secure_email_gateway

Weakness classification (CWE)

CWE-90 — LDAP Injection

References

vulnerability@ncsc.ch (release-notes, Release Notes)

Frequently asked questions

What is CVE-2026-29138?: CVE-2026-29138 is a high-severity vulnerability in Seppmail Secure Email Gateway, classified under LDAP Injection. CVSS score: 7.5/10. Published 2026-04-02.
How severe is CVE-2026-29138?: High severity. CVSS v3 base score is 7.5 out of 10.