CVE-2026-91051: CWE-502 Deserialization of Untrusted Data in EWWW Image Optimizer
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 .
AI Analysis
Technical Summary
The EWWW Image Optimizer WordPress plugin before version 8.8.0 improperly handles deserialization of untrusted data stored in post meta fields by authenticated users with author-level permissions. This flaw allows PHP Object Injection, which can escalate to remote code execution when combined with a suitable gadget chain, particularly if another vulnerable instance of the plugin is installed. The vulnerability affects versions >=8.6.0 and <8.8.0.
Potential Impact
An attacker with author-level access can exploit this vulnerability to inject malicious PHP objects via serialized data in post meta fields. This can lead to remote code execution if a suitable gadget chain exists, potentially compromising the WordPress site.
Mitigation Recommendations
Upgrade the EWWW Image Optimizer plugin to version 8.8.0 or later, where this vulnerability is fixed. No other mitigations are indicated. Patch status is confirmed by the version range affected and the fixed version 8.8.0.
CVE-2026-91051: CWE-502 Deserialization of Untrusted Data in EWWW Image Optimizer
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 .
Affected software
EWWW Image Optimizer
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The EWWW Image Optimizer WordPress plugin before version 8.8.0 improperly handles deserialization of untrusted data stored in post meta fields by authenticated users with author-level permissions. This flaw allows PHP Object Injection, which can escalate to remote code execution when combined with a suitable gadget chain, particularly if another vulnerable instance of the plugin is installed. The vulnerability affects versions >=8.6.0 and <8.8.0.
Potential Impact
An attacker with author-level access can exploit this vulnerability to inject malicious PHP objects via serialized data in post meta fields. This can lead to remote code execution if a suitable gadget chain exists, potentially compromising the WordPress site.
Mitigation Recommendations
Upgrade the EWWW Image Optimizer plugin to version 8.8.0 or later, where this vulnerability is fixed. No other mitigations are indicated. Patch status is confirmed by the version range affected and the fixed version 8.8.0.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WPScan
- Date Reserved
- 2026-09-14T17:15:20.460Z
- State
- PUBLISHED
Threat ID: 6abcab01236a9c741f0494ba
Added to database: 09/30/2026, 06:24:01 UTC
Last enriched: 09/30/2026, 06:38:57 UTC
Last updated: 09/30/2026, 07:39:49 UTC
Views: 5
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