Use of hardcoded cryptographic key in Encryption.cs in hMailServer 5.8.6 and 5.6.9-beta…
Priority MEDIUM 54CWE-321Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-321.
Summary
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00232 14th percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
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
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:hmailserver:hmailserver:5.6.9:beta:*:*:*:*:*:* | 5.6.9 beta | Vulnerable | Hmailserver |
| cpe:2.3:a:hmailserver:hmailserver:5.8.6:*:*:*:*:*:*:* | 5.8.6 | Vulnerable | Hmailserver |
- cpe:2.3:a:hmailserver:hmailserver:5.6.9:beta:*:*:*:*:*:* Versions 5.6.9 beta Vulnerable ·Hmailserver
- cpe:2.3:a:hmailserver:hmailserver:5.8.6:*:*:*:*:*:*:* Versions 5.8.6 Vulnerable ·Hmailserver
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2025-52374
- 2026-10-03 Alias added: GHSA-q363-f26m-jj5j
References
More Hmailserver vulnerabilities
- TI-2025-32547 An issue in hMailServer v.5.8.6 allows a local attacker to obtain sensitive information… CVSS 3.1MEDIUM 5.1
- TI-2025-32548 Use of hardcoded cryptographic key in BlowFish.cpp in hMailServer 5.8.6 and 5.6.9-beta… CVSS 3.1MEDIUM 4.6
- TI-2013-04764 HMailServer 5.3.x and prior: Memory Corruption which could cause DOS CVSS 3.1MEDIUM 5.9
- TI-2008-03520 Unspecified vulnerability in the IMAP server in hMailServer 4.4.1 allows remote… CVSS 2.0MEDIUM 4.3
Sources
- CVE-2025-52374 · CVE Program
- CVE-2025-52374 · NVD
- FIRST EPSS
- GHSA-q363-f26m-jj5j · 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