CVE-2026-28176 WordPress Booking Activities plugin <= 1.18.4 - PHP Object Injection vulnerability
Unauthenticated attackers can exploit PHP object injection in the Booking Activities plugin to potentially execute arbitrary code.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-28176?
CVE-2026-28176 is a high-severity unsafe deserialization vulnerability in Booking Activities, published on 13 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Unauthenticated PHP Object Injection in Booking Activities <= 1.18.4 versions.
Weakness: CWE-502
Which versions are affected by CVE-2026-28176?
How do I fix CVE-2026-28176?
No fix has been published for CVE-2026-28176 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-2026-28176 being exploited?
There is no known exploitation of CVE-2026-28176 in the wild and no public exploit code.
Sources
Also known as GHSA-mc9r-rc7r-x444.