CVE-2026-29137Disclosure(seppmail / secure_email_gateway)

LOWCVSS 5.3 · MEDIUM

Signal is active with 1 mentions in latest observed window

Immediate actions

Patch seppmail secure_email_gateway systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

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

seppmail CVEs Back to dashboard

0.5/ 10 priority

Sources & remediation

Other references

https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html#seppmail-vulnerability-disclosure-1503

Weakness type (CWE)

CWE-20

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

secure_email_gateway

Threat summary

Patch or workaround signal is available
1 mentions across 1 observed day

What's happening

Patch or workaround mentioned in 1 signal
Technical details provided in 1 signal
Disclosure: 1 classified signal
1 total mentions across 1 day

Affected systems

Vendors

seppmail

Products

secure_email_gateway

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

Disclosure

1100.0%

Referenced assets1 URL

By indicator

https://www.cve.org/CVERecord?id=CVE-2026-29137

Full discourse1 post

CVE@CVEnew189d
Disclosure
CVE-2026-29137 SEPPmail Secure Email Gateway before version 15.0.3 allows an attacker to hide security tags from users by crafting a long subject. https://www.cve.org/CVERecord?id=CVE-2026-29137
Post summary
The post provides initial details of a new vulnerability in SEPPmail Secure Email Gateway, outlining how malicious users can hide security tags via a long subject line and indicating that version 15.0.3 addresses the issue.
0001093
56.9K followersView on X

CPE platform detail1 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

1 of 1 entries

Part	Vendor	Product	Version	Target SW	Target HW
App	seppmail	secure_email_gateway	-	-	-

Explore more

Back to dashboard seppmail CVEs secure_email_gateway vulnerabilities