MailMate before 1.11.3 mishandles a suspicious HTML/MIME structure in a signed/encrypted email.
Priority LOW 38CWE-290Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · High · None
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-290.
Summary
MailMate before 1.11.3 mishandles a suspicious HTML/MIME structure in a signed/encrypted email.
Why it matters now
EPSS 0.02445 84th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2018-15588
- 2026-10-03 Alias added: GHSA-j44j-72m9-g4fp
References
Advisory 4
More Freron Mailmate vulnerabilities
- TI-2017-12945 The OpenPGP specification allows a Cipher Feedback Mode (CFB) malleability-gadget attack… CVSS 3.0MEDIUM 5.9
- TI-2017-12946 The S/MIME specification allows a Cipher Block Chaining (CBC) malleability-gadget attack… CVSS 3.0MEDIUM 5.9
- TI-2020-10038 MailMate before 1.11 automatically imported S/MIME certificates and thereby silently… CVSS 3.1MEDIUM 5.9
Sources
- CVE-2018-15588 · CVE Program
- CVE-2018-15588 · NVD
- FIRST EPSS
- GHSA-j44j-72m9-g4fp · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences