CVE-2026-54806 WordPress WP Activity Log plugin <= 5.6.3.1 - PHP Object Injection vulnerability
Unauthenticated attackers can exploit PHP object injection in WP Activity Log to potentially execute arbitrary code on the server.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-54806?
CVE-2026-54806 is a critical unsafe deserialization vulnerability in Melapress WP Activity Log, published on 17 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Unauthenticated PHP Object Injection in WP Activity Log <= 5.6.3.1 versions.
Weakness: CWE-502
Which versions are affected by CVE-2026-54806?
How do I fix CVE-2026-54806?
No fix has been published for CVE-2026-54806 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-2026-54806 being exploited?
There is no known exploitation of CVE-2026-54806 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-5hfr-j85r-7cqx.