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6.9
SEPPmail Secure Email Gateway PGP Signature Spoofing Risk
CVE-2026-27445
Summary
SEPPmail Secure Email Gateway users are at risk of receiving fake emails masquerading as genuine ones. This is because the software does not properly check if a PGP signature was created by the expected sender. To protect yourself, update to version 15.0.1 or later.
What to do
No fix is available yet. Check with your software vendor for updates.
Affected software
| Vendor | Product | Affected versions | Fix available |
|---|---|---|---|
| seppmail | seppmail | <= 15.0.1 | – |
Original title
SEPPmail Secure Email Gateway before version 15.0.1 does not properly verify that a PGP signature was generated by the expected key, allowing signature spoofing.
Original description
SEPPmail Secure Email Gateway before version 15.0.1 does not properly verify that a PGP signature was generated by the expected key, allowing signature spoofing.
nvd CVSS3.1
5.3
nvd CVSS4.0
6.9
Vulnerability type
CWE-347
Improper Verification of Cryptographic Signature
Published: 4 Mar 2026 · Updated: 13 Mar 2026 · First seen: 6 Mar 2026