CVE-2026-105436 WordPress MainWP Child plugin <= 6.2.1 - Deserialization of untrusted data vulnerability
An attacker can exploit untrusted data deserialization in the MainWP Child plugin to potentially execute arbitrary code on the WordPress site.
- 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-2026-105436?
CVE-2026-105436 is a high-severity unsafe deserialization vulnerability in MainWP Child, published on 8 Oct 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
Deserialization of Untrusted Data vulnerability in MainWP MainWP Child mainwp-child allows Object Injection.This issue affects MainWP Child: from n/a through 6.2.1.
Weakness: CWE-502
Which versions are affected by CVE-2026-105436?
How do I fix CVE-2026-105436?
No fix has been published for CVE-2026-105436 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-2026-105436 being exploited?
There is no known exploitation of CVE-2026-105436 in the wild and no public exploit code.
Sources
Also known as GHSA-c5vm-w849-ffj7.