CVE-2026-0726 Deserialization in Nexter Extension – Security, Performance, Code Snippets & Site Toolkit
Unauthenticated attackers can inject PHP objects via deserialization, potentially leading to code execution or data theft if a POP chain exists.
- 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-2026-0726?
CVE-2026-0726 is a high-severity unsafe deserialization vulnerability in posimyththemes Nexter Extension – Security, Performance, Code Snippets & Site Toolkit, published on 20 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Nexter Extension – Site Enhancements Toolkit plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 4.4.6 via deserialization of untrusted input in the 'nxt_unserialize_replace' function. This makes it possible for unauthenticated attackers 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.
Weakness: CWE-502
Which versions are affected by CVE-2026-0726?
How do I fix CVE-2026-0726?
No fix has been published for CVE-2026-0726 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-2026-0726 being exploited?
There is no known exploitation of CVE-2026-0726 in the wild and no public exploit code.
Sources
Also known as GHSA-wh27-24q4-8pfv.