EUVD-2026-89618
GHSA-rhvr-pxgv-9rpq
Severity by source
AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Author is a low-privilege WordPress role (PR:L, not PR:H); AC:H because reliable RCE requires a suitable gadget chain; network vector with full C/I/A on successful injection-to-RCE.
Primary rating from Vendor (wpscan).
CVSS VectorVendor: wpscan
Lifecycle Timeline
4DescriptionCVE.org
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 .
AnalysisAI
PHP Object Injection in the EWWW Image Optimizer WordPress plugin before 8.8.0 allows an authenticated user holding author-level or higher privileges to persist a serialized payload into a post meta field that the plugin unserializes when the post is rendered, which can escalate to remote code execution when a suitable POP gadget chain is reachable in EWWW itself or in another installed plugin or theme. Exploitation is conditional: it requires a valid author (or higher) account, the ability to write the offending meta value, and the affected post being rendered, and without a usable gadget chain the outcome stops at object injection rather than code execution. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires an authenticated WordPress account with at least author-level capabilities on a site running EWWW Image Optimizer before 8.8.0, plus the ability to save post meta containing a serialized payload. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine but conditional risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: upgrade EWWW Image Optimizer to 8.8.0 or later - this is the first fixed release and the plugin can be updated from the WordPress dashboard or via WP-CLI ('wp plugin update ewww-image-optimizer'). … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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