Vulnerability · Published Apr 23, 2026 · Assigned by GitHub_M

CVE-2026-41232Froxlor has an Email Sender Alias Domain Ownership Bypass via Wrong Array Index that Allows Cross-Customer Email Spoofing

Medium 5.0

In plain English

A medium-severity incorrect authorization in froxlor from froxlor. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 14% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.0Medium

Exploit odds (30 days)0.2%top 86.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	froxlor/froxlor	2.3.6	GHSA-vmjj-qr7v-pxm6

Affected products (as reported)

Vendor	Product	Versions
froxlor	froxlor	< 2.3.6

Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N

References

https://github.com/froxlor/froxlor/security/advisories/GHSA-vmjj-qr7v-pxm6 x_refsource_CONFIRM
https://github.com/froxlor/froxlor/commit/77d04badf549d5f8429828f0fbc69bc37a35e07a x_refsource_MISC
https://github.com/froxlor/froxlor/releases/tag/2.3.6 x_refsource_MISC