Medium severity · published Sep 30, 2026
CVE-2026-91051
EWWW Image Optimizer 8.6.0 - 8.7.7 - Author+ PHP Object Injection via 'eio_page_settings' Post Meta
6.6
CVSS
0.3%
EPSS
No
On KEV
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 .
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
High
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 27% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EI
EWWW Image Optimizer ·
8.6.0 before 8.8.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-91051
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-91051
exploit
https://wpscan.com/vulnerability/e24a9497-8fb4-4067-8421-194725455d55/
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