CVE-2026-86841 Bookly 23.2 - 28.2 - Bookly Administrator+ PHP Object Injection via Diagnostics Advanced Options
Privileged users can inject PHP objects to execute code and read secrets in the Bookly WordPress plugin.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-86841?
CVE-2026-86841 is a medium-severity unsafe deserialization vulnerability in Unknown Online Scheduling and Appointment Booking System, published on 27 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
The Online Scheduling and Appointment Booking System WordPress plugin before 28.3 does not prevent deserialization of untrusted input and does not correctly restrict a privileged maintenance feature to administrators, allowing users granted a custom booking-management capability, which an administrator must explicitly assign, to inject arbitrary PHP objects, overwrite privileged site options, and read stored integration secrets.
Weakness: CWE-502
Which versions are affected by CVE-2026-86841?
How do I fix CVE-2026-86841?
No fix has been published for CVE-2026-86841 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-86841 being exploited?
There is no known exploitation of CVE-2026-86841 in the wild and no public exploit code.
Sources
Also known as GHSA-ggx5-r53p-pf97.