CVE-2026-91051CWE-502insecure-deserialization

CVE-2026-91051

Medium · published September 30, 2026

CVSS v3.1
6.6
EPSS
0%
Percentile
27.5
In the wild
Unconfirmed
What it is

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 .

The record
Technical detail
CVSS v3.1
6.6 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00351 · 27.5th percentile
Weakness
CWE-502 · Deserialization of Untrusted Data
Published
2026-09-30T10:17Z
References (1)
https://wpscan.com/vulnerability/e24a9497-8fb4-4067-8421-194725455d55/ · [email protected]
EPSS history
Timeline
  • 01 OCT 03:50Z
    EPSS moved — → 0%
    epss
  • 30 SEP 06:00Z
    EWWW Image Optimizer 8.6.0 - 8.7.7 - Author+ PHP Object Injection via 'eio_page_settings' Post Meta
    cvelistv5