CVE-2026-89294 Simply Schedule Appointments <= 1.6.12.27 - Authenticated (Subscriber+) Local File Inclusion via 'ssa_locale' Parameter
Authenticated attackers can exploit a local file inclusion vulnerability in the Simply Schedule Appointments plugin to execute arbitrary PHP code and read sensitive data.
- 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-2026-89294?
CVE-2026-89294 is a high-severity path traversal vulnerability in croixhaug Simply Schedule Appointments, published on 30 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Simply Schedule Appointments plugin for WordPress is vulnerable to Local File Inclusion in all versions up to, and including, 1.6.12.27 via the 'ssa_locale' parameter parameter. This makes it possible for authenticated attackers, with subscriber-level access and above, to include and execute arbitrary .php files on the server, allowing the execution of any PHP code in those files. This can be used to bypass access controls, obtain sensitive data, or achieve code execution in cases where .php file types can be uploaded and included. Notably, exploitation does not require authentication in practice, as the locale filter is installed unconditionally on every request during plugins_loaded and the callback performs no nonce or capability check before returning the raw GET parameter value.
Weakness: CWE-98
Which versions are affected by CVE-2026-89294?
How do I fix CVE-2026-89294?
No fix has been published for CVE-2026-89294 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-89294 being exploited?
There is no known exploitation of CVE-2026-89294 in the wild and no public exploit code.
Sources
Also known as GHSA-82vp-79qw-w7jm.