Vulnerability in Hmailserver
CVE-2025-52374
Use of hardcoded cryptographic key in Encryption.cs in hMailServer 5.8.6 and 5.6.9-beta allows attacker to decrypt passwords to other servers from hMailAdmin.exe.config file to access other hMailServer admin consoles with configured connections.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.6 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (9.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 9th percentile — 9.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- Hmailserver — versions 5.6.9, 5.8.6
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/mojibake-dev/hMailEnum (Exploit, Third Party Advisory)
- github.com/hmailserver/hmailserver (Product)
- github.com/mojibake-dev/mojibake-CVE/blob/main/hMailServer/CVE-2025-52374.md (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2025-52374?
- CVE-2025-52374 is a medium-severity vulnerability in Hmailserver, classified under Use of Hard-coded Cryptographic Key. CVSS score: 4.6/10. Published 2025-07-21.
- How severe is CVE-2025-52374?
- Medium severity. CVSS v3 base score is 4.6 out of 10.
- Is CVE-2025-52374 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.