CVE-2026-126159: High severity vulnerability
A authorization bypass through user-controlled key vulnerability in Fortinet FortiMail 8.0.0 through 8.0.1, FortiMail 7.6.0 through 7.6.6, FortiMail 7.4.0 through 7.4.8, FortiMail 7.2 all versions may allow an unauthenticated attacker to release or delete quarantined messages for arbitrary mailboxes via a crafted quarantine release request.
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
FortiMailto a version that resolves this vulnerability.Fixed in 7.4.9 - Upgrade
Upgrade
FortiMailto a version that resolves this vulnerability.Fixed in 7.6.7 - Upgrade
Upgrade
FortiMailto a version that resolves this vulnerability.Fixed in 8.0.2
Event History
Frequently Asked Questions
Which FortiMail deployments are affected?
Affected versions are FortiMail 8.0.0 through 8.0.1, 7.6.0 through 7.6.6, 7.4.0 through 7.4.8, and all FortiMail 7.2 versions.
Does exploitation require authentication or user interaction?
No. The vulnerability can be exploited by an unauthenticated attacker and does not require user interaction.
What can an attacker do if exploitation succeeds?
An attacker can use a crafted quarantine release request to release or delete quarantined messages belonging to arbitrary mailboxes.