EUVD-2026-18154
2026-04-02
NCSC.ch
5.3
CVSS 4.0
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CVSS Vector
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
P
Scope
X
Lifecycle Timeline
3
EUVD ID Assigned
Apr 02, 2026 - 09:00 euvd
EUVD-2026-18154
Analysis Generated
Apr 02, 2026 - 09:00 vuln.today
CVE Published
Apr 02, 2026 - 08:42 nvd
MEDIUM 5.3
Description
SEPPmail Secure Email Gateway before version 15.0.3 allows an attacker to hide security tags from users by crafting a long subject.
Analysis
SEPPmail Secure Email Gateway before version 15.0.3 allows remote attackers to conceal security tags from end users by submitting emails with excessively long subject lines, enabling potential phishing and message spoofing attacks by bypassing visual security indicators. The vulnerability affects all versions prior to 15.0.3 across the product line and has been reported by Switzerland's National Cyber Security Centre (NCSC.ch). …
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Priority Score
27
Low
Medium
High
Critical
KEV: 0
EPSS: +0.1
CVSS: +26
POC: 0
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External POC / Exploit Code
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