CVE-2026-104658
Last modified
CVE-2026-104658 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. The Linux live-update apply helper (hmailserver-update) of Progressive Robot hMailServer 6.3.4 and 6.3.5 runs as root on a request file written by the unprivileged hmailserver service account, and took from that request the program used to verify an AppImage update's signature and the systemd unit to stop before reading the service account's files. An attacker who already runs code as the hmailserver service account, for example through another flaw in the mail server, can therefore have arbitrary code executed as root, on any Linux installation where the live update's path unit is active - the default for the project's .deb and .rpm packages - and on AppImage installations run under that unit..
Description
The Linux live-update apply helper (hmailserver-update) of Progressive Robot hMailServer 6.3.4 and 6.3.5 runs as root on a request file written by the unprivileged hmailserver service account, and took from that request the program used to verify an AppImage update's signature and the systemd unit to stop before reading the service account's files. An attacker who already runs code as the hmailserver service account, for example through another flaw in the mail server, can therefore have arbitrary code executed as root, on any Linux installation where the live update's path unit is active - the default for the project's .deb and .rpm packages - and on AppImage installations run under that unit.
Metrics
Weakness Enumeration
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Progressive Robot Ltd | hMailServer | >= 6.3.4, < 6.3.6 |
References
Timeline
- Published
- Last Modified
- Status
- Deferred
Frequently Asked Questions
What is CVE-2026-104658?
How severe is CVE-2026-104658?
How do I fix CVE-2026-104658?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-104644The Image Photo Gallery Final Tiles Grid WordPress plugin be…6.8
- CVE-2026-104645The Image Photo Gallery Final Tiles Grid WordPress plugin be…2.7
- CVE-2026-104646The Image Photo Gallery Final Tiles Grid WordPress plugin be…6.8
- CVE-2026-104651The Yaad Sarig Payment Gateway For WC WordPress plugin befor…4.3
- CVE-2026-104652The Envira Gallery WordPress plugin before 1.16.1 does not …6.8
- CVE-2026-104653The Envira Gallery WordPress plugin before 1.16.1 does not …6.8
- CVE-2026-104659Missing Host header validation and missing throttling of fai…7.5
- CVE-2026-104660Missing authorization on COM objects in Progressive Robot hM…7.8
- CVE-2026-104661GitLab has remediated an issue in GitLab EE affecting all ve…4.3
- CVE-2026-104667The Animated Number Counters WordPress plugin before 3.1 doe…6.8
- CVE-2026-104670Unauthenticated Cross Site Scripting (XSS) in LearnPress <= …7.1
- CVE-2026-104671The TutorStarter WordPress theme before 4.0.4 does not respe…5.3
Are you affected by CVE-2026-104658?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST