CVE-2026-29137 | BDVDB-2026-324367 Detail

SEPPmailSecure Email Gateway

Description#

SEPPmail Secure Email Gateway before version 15.0.3 allows an attacker to hide security tags from users by crafting a long subject.

CAPEC-194 Fake the Source of Data

No public exploit known

5.3 Medium

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 9.0.

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Improper Input Validation

No specific action is recorded in the source data. Check the references for vendor guidance.

5.3 Medium

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Attack Requirements	None
Privileges Required	None
User Interaction	Passive
Vulnerable System Confidentiality	None
Vulnerable System Integrity	Low
Vulnerable System Availability	None
Subsequent System Confidentiality	None
Subsequent System Integrity	Low
Subsequent System Availability	None

Not available

Not available

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).