CVE-2026-7637 Boost <= 2.0.3 - Unauthenticated PHP Object Injection via STYXKEY-BOOST_USER_LOCATION Cookie
Unauthenticated attackers can inject PHP objects via a cookie, 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-2026-7637?
CVE-2026-7637 is a critical unsafe deserialization vulnerability in PixelYourSite Boost, published on 20 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Boost plugin for WordPress is vulnerable to PHP Object Injection in versions up to, and including, 2.0.3 via deserialization of untrusted input in the STYXKEY-BOOST_USER_LOCATION cookie. 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-2026-7637?
How do I fix CVE-2026-7637?
No fix has been published for CVE-2026-7637 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-2026-7637 being exploited?
There is no known exploitation of CVE-2026-7637 in the wild and no public exploit code.
Sources
Also known as AZL-110373, GHSA-r5mf-5vch-2vpf.