CVE-2026-48810: FreeScout: Thread Edit Authorization Bypass via Missing Mailbox Check
FreeScout is a free help desk and shared inbox built with PHP's Laravel framework. Prior to 1.8.221, while investigating the ThreadPolicy::delete issue reported previously, the same missing mailbox membership check was found in the sibling ThreadPolicy::edit method. A user with the PERMEDITCONVERSATIONS permission who created a message or internal note in Mailbox A can rewrite that thread's body after an administrator removes them from Mailbox A, because the policy checks only authorship and a global permission flag — not current mailbox membership. This vulnerability is fixed in 1.8.221.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
FreeScoutto a version that resolves this vulnerability.Fixed in 1.8.221
Event History
Frequently Asked Questions
What is the severity of CVE-2026-48810?
CVE-2026-48810 has a medium severity rating of 4.3.
How do I fix CVE-2026-48810?
To fix CVE-2026-48810, update FreeScout to version 1.8.221 or later.
What type of vulnerability is CVE-2026-48810?
CVE-2026-48810 is an authorization bypass vulnerability due to a missing mailbox membership check.
Who is affected by CVE-2026-48810?
Users of FreeScout prior to version 1.8.221 are at risk from CVE-2026-48810.
What can be exploited in CVE-2026-48810?
CVE-2026-48810 can be exploited to allow unauthorized users to edit threads by bypassing the authorization checks.