CVE-2026-104734 Deserialization in Kirki – Freeform Page Builder, Website Builder & Customizer
Authenticated attackers can exploit PHP object injection via ZIP import, potentially leading to code execution or data access if a POP chain exists.
- 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-2026-104734?
CVE-2026-104734 is a high-severity unsafe deserialization vulnerability in themeum Kirki – Freeform Page Builder, Website Builder & Customizer, published on 17 Oct 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
The Kirki – Freeform Page Builder, Website Builder & Customizer plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 6.3.2 via deserialization of untrusted input . This makes it possible for authenticated attackers, with administrator-level access and above, to inject a PHP Object. No known POP chain is present in the vulnerable software, which means this vulnerability has no impact unless another plugin or theme containing a POP chain is installed on the site. If a POP chain is present via an additional plugin or theme installed on the target system, it may allow the attacker to perform actions like delete arbitrary files, retrieve sensitive data, or execute code depending on the POP chain present. By default, Editor-level users are granted FULL_ACCESS to the plugin's import endpoint via the KIRKI_USERS_DEFAULT_FULL_ACCESS configuration, meaning exploitation is possible at Editor privilege level rather than being restricted to administrators alone.
Weakness: CWE-502
Which versions are affected by CVE-2026-104734?
How do I fix CVE-2026-104734?
No fix has been published for CVE-2026-104734 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-2026-104734 being exploited?
There is no known exploitation of CVE-2026-104734 in the wild and no public exploit code.
Sources
Also known as GHSA-9858-wmm9-p4jw.