CVE-2026-91051 EWWW Image Optimizer 8.6.0 - 8.7.7 - Author+ PHP Object Injection via 'eio_page_settings' Post Meta
Authenticated authors can trigger PHP object injection via post meta, potentially leading to remote code execution if gadget chains exist.
- 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-2026-91051?
CVE-2026-91051 is a medium-severity unsafe deserialization vulnerability in Unknown EWWW Image Optimizer, published on 30 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
The EWWW Image Optimizer WordPress plugin before 8.8.0 does not prevent authenticated users with author-level permissions from storing a serialized value in a post meta field that is deserialized when the post is rendered, allowing them to perform PHP Object Injection, which can lead to remote code execution when a suitable gadget chain is present via another installed EWWW Image Optimizer WordPress plugin before 8.8.0 or .
Weakness: CWE-502
Which versions are affected by CVE-2026-91051?
How do I fix CVE-2026-91051?
No fix has been published for CVE-2026-91051 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-2026-91051 being exploited?
There is no known exploitation of CVE-2026-91051 in the wild and no public exploit code.
Sources
Also known as GHSA-rhvr-pxgv-9rpq.