---
id: CVE-2026-113599
title: Modoboa before 2.8.0 IDOR via API v2 armessages Auto-Reply Creation
summary: >-
  Modoboa before 2.8.0 contains an insecure direct object reference
  vulnerability that allows authenticated users to create auto-reply messages
  for arbitrary mailboxes by supplying another user's mbox value. Attackers can
  POST to /api/v2/a…
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L'
cvssSource: cna
cwe:
  - CWE-639
vendor: modoboa
product: modoboa
affected:
  - modoboa < 2.8.0
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-20T16:19:12.124795Z'
published: '2026-10-20'
updated: '2026-10-20'
sourceUpdated: '2026-10-20T16:19:21.574Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-113599'
references:
  - url: 'https://github.com/modoboa/modoboa/issues/3945'
  - url: >-
      https://github.com/modoboa/modoboa/commit/e0a4e3b9ee8ad84dba46e4c0f04cbbe7cf78c38d
  - url: 'https://github.com/modoboa/modoboa/releases/tag/2.8.0'
    label: modoboa 2.8.0 Release Notes
  - url: >-
      https://github.com/modoboa/modoboa/blob/2.7.2/modoboa/autoreply/api/v2/serializers.py
  - url: >-
      https://www.vulncheck.com/advisories/modoboa-before-2.8.0-idor-via-api-v2-armessages-auto-reply-creation
    label: >-
      VulnCheck Advisory: Modoboa before 2.8.0 IDOR via API v2 armessages
      Auto-Reply Creation
tags:
  - cve.org
ingestedAt: '2026-10-20T16:10:53.304Z'
---

## Overview

Modoboa before 2.8.0 contains an insecure direct object reference vulnerability that allows authenticated users to create auto-reply messages for arbitrary mailboxes by supplying another user's mbox value. Attackers can POST to /api/v2/armessages/ to inject attacker-controlled auto-reply subject and content into victims' settings or break their auto-reply management via MultipleObjectsReturned errors.

## Affected

- `modoboa < 2.8.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.