CVE-2026-100506 WordPress WP Spell Check plugin <= 12.1 - PHP Object Injection vulnerability
An attacker can exploit PHP object injection in the WP Spell Check plugin to potentially execute arbitrary code on the WordPress site.
- 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-2026-100506?
CVE-2026-100506 is a high-severity unsafe deserialization vulnerability in WP Spell Check, published on 5 Oct 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
Deserialization of Untrusted Data vulnerability in WP Spell Check WP Spell Check wp-spell-check allows Object Injection.This issue affects WP Spell Check: from n/a through 12.1.
Weakness: CWE-502
Which versions are affected by CVE-2026-100506?
How do I fix CVE-2026-100506?
No fix has been published for CVE-2026-100506 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-2026-100506 being exploited?
There is no known exploitation of CVE-2026-100506 in the wild and no public exploit code.
Sources
Also known as GHSA-29vv-gx7g-vm7g.