CVE-2026-41232Public exploitNetwork attack vector

Cross-customer email spoofing via wrong array index

Published Apr 23, 2026 · Updated Apr 23, 2026

Incorrect authorization in Froxlor before 2.3.6 allows remote authenticated users to spoof email senders across customer domains. EmailSender::add() passes the address's local part instead of its domain to validateLocalDomainOwnership(), so a missing domain row is treated as authorization. The attack requires a customer account and enabled sender aliases; successful aliases let Postfix send mail as another customer's addresses.

CVSS severity5.0
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in Froxlor before 2.3.6 allows remote authenticated users to spoof email senders across customer domains. EmailSender::add() passes the address's local part instead of its domain to validateLocalDomainOwnership(), so a missing domain row is treated as authorization. The attack requires a customer account and enabled sender aliases; successful aliases let Postfix send mail as another customer's addresses.

The record

CVE
CVE-2026-41232
Published
Apr 23, 2026
Updated
Apr 23, 2026
Vendor
Froxlor
Product
Froxlor
Classifications
CWE-863, T1036
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.3.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Froxlor · Froxlorversion=< 2.3.6

Published CVSS scores

5.0GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1036Masquerading

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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