What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-20 · updated 2026-10-20
• Weakness: CWE-639

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

• modoboa/modoboa: before 2.8.0 — fixed in 2.8.0

How to fix

Upgrade to a fixed version: modoboa/modoboa 2.8.0. Check the vendor advisory for mitigations.

References

• https://github.com/modoboa/modoboa/blob/2.7.2/modoboa/autoreply/api/v2/serializers.py
• https://github.com/modoboa/modoboa/commit/e0a4e3b9ee8ad84dba46e4c0f04cbbe7cf78c38d
• https://github.com/modoboa/modoboa/issues/3945
• https://github.com/modoboa/modoboa/releases/tag/2.8.0
• https://www.vulncheck.com/advisories/modoboa-before-2.8.0-idor-via-api-v2-armessages-auto-reply-creation

Get alerted when CVE-2026-113599 or the next vulnerability affects your stack