VulnSocial

CVE-2026-29143Disclosure(seppmail / secure_email_gateway)

LOWCVSS 9.1 · CRITICAL

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

SEPPmail Secure Email Gateway before version 15.0.3 does not properly authenticate the inner message of S/MIME-encrypted MIME entities, allowing an attacker to control trusted headers.

seppmail CVEsBack to dashboard
0.0/ 10 priority

Sources & remediation

Other references
Weakness type (CWE)
CWE-20

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

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

  • 1 mentions across 1 observed day

What's happening

  • 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
00111Mentions · 2026-04-02: 1Technical Details · 2026-04-02: 104-02
Signal classification1 categories
Disclosure
1100.0%
Referenced assets1 URL
By indicator
Full discourse1 post
  • CVE@CVEnew
    Disclosure

    CVE-2026-29143 SEPPmail Secure Email Gateway before version 15.0.3 does not properly authenticate the inner message of S/MIME-encrypted MIME entities, allowing an attacker to contro… https://www.cve.org/CVERecord?id=CVE-2026-29143

    Post summary

    The CVE discloses an authentication issue in SEPPmail Secure Email Gateway versions prior to 15.0.3 that could allow attackers to manipulate inner messages within S/MIME‑encrypted MIME entities.

    0000083
    56.9K followersView on X
CPE platform detail1 entries

1 of 1 entries

PartVendorProductVersionTarget SWTarget HW
Appseppmailsecure_email_gateway---

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