CVE-2026-48810 FreeScout: Thread Edit Authorization Bypass via Missing Mailbox Check
An attacker with edit permissions can modify threads in mailboxes they no longer have access to due to missing membership checks.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-48810?
CVE-2026-48810 is a medium-severity missing authorization vulnerability in freescout-help-desk freescout, published on 29 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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 PERM_EDIT_CONVERSATIONS 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.
Weakness: CWE-285
Which versions are affected by CVE-2026-48810?
How do I fix CVE-2026-48810?
No fix has been published for CVE-2026-48810 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-48810 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-48810 exists.
Sources
Also known as GHSA-3w38-h42v-3h6w.