Medium severity · published May 29, 2026
CVE-2026-48810
FreeScout: Thread Edit Authorization Bypass via Missing Mailbox Check
4.3
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 5% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FR
freescout · freescout-help-desk
< 1.8.221 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-48810
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-48810
github.com
https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-3w38-h42v-3h6w
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