CVE-2026-109306 Craft CMS 5.0.0 before 5.10.14 Missing Authorization via app/switch-to-licensed-edition
Authenticated users can bypass authorization to downgrade the CMS edition, causing persistent configuration changes that administrators cannot reverse.
- 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-2026-109306?
CVE-2026-109306 is a medium-severity missing authorization vulnerability in craftcms cms, published on 12 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Craft CMS from 5.0.0 before 5.10.14 contains a missing authorization vulnerability in AppController::actionSwitchToLicensedEdition() that lets any authenticated user change the installed edition. Low-privileged front-end users can call the action route when the licensed edition mismatches to persistently downgrade the site edition in project config, which admins cannot reverse from the control panel.
Weakness: CWE-862
Which versions are affected by CVE-2026-109306?
How do I fix CVE-2026-109306?
No fix has been published for CVE-2026-109306 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-2026-109306 being exploited?
There is no known exploitation of CVE-2026-109306 in the wild and no public exploit code.
Sources
Also known as GHSA-4wfw-q5w3-jh42, GHSA-g9xf-4797-9phm.