Vulnerability · Published Oct 20, 2026 · Assigned by VulnCheck

CVE-2026-113599Modoboa before 2.8.0 IDOR via API v2 armessages Auto-Reply Creation

Medium 5.4

In plain English

A medium-severity authorization bypass via user-controlled key in modoboa from modoboa. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 28% of all known vulnerabilities).

Severity (CVSS 3.1)5.4Medium

Exploit odds (30 days)0.3%top 72.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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 products (as reported)

Vendor	Product	Versions
modoboa	modoboa	0 – before 2.8.0

Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

References

https://github.com/modoboa/modoboa/issues/3945 issue-tracking
https://github.com/modoboa/modoboa/commit/e0a4e3b9ee8ad84dba46e4c0f04cbbe7cf78c38d patch
modoboa 2.8.0 Release Notes release-notes
https://github.com/modoboa/modoboa/blob/2.7.2/modoboa/autoreply/api/v2/serializers.py technical-description
VulnCheck Advisory: Modoboa before 2.8.0 IDOR via API v2 armessages Auto-Reply Creation third-party-advisory