Auth bypass in Froxlor
CVE-2026-41232
Froxlor is open source server administration software. Prior to version 2.3.6, in `EmailSender::add()`, the domain ownership validation for full email sender aliases uses the wrong array index when splitting the email address, passing the local part instead of the domain to `validateLocalDomainOwnership()`. This causes the ownership check to always pass for non-existent "domains," allowing any authenticated customer to add sender aliases for email addresses on domains belonging to other customers. Postfix's `sender_login_maps` then authorizes the attacker to send emails as those addresses. Version 2.3.6 fixes the issue.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.0 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (24.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 24th percentile — 24.4% 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: 0.003 · change: +0.001
Affected products
- Froxlor — versions < 2.3.6
Weakness classification (CWE)
References
- github.com/froxlor/froxlor/security/advisories/GHSA-vmjj-qr7v-pxm6 (Exploit, Mitigation, Vendor Advisory)
- github.com/froxlor/froxlor/commit/77d04badf549d5f8429828f0fbc69bc37a35e07a (Patch)
- github.com/froxlor/froxlor/releases/tag/2.3.6 (Release Notes)
Frequently asked questions
- What is CVE-2026-41232?
- CVE-2026-41232 is a medium-severity vulnerability in Froxlor, classified under Incorrect Authorization. CVSS score: 5.0/10. Published 2026-04-23.
- How severe is CVE-2026-41232?
- Medium severity. CVSS v3 base score is 5.0 out of 10.