CVE-2025-13856: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in michaelcole1991 Extra Post Images
The Extra Post Images plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'id' parameter of the extra-images shortcode in all versions up to, and including, 1.0 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
AI Analysis
Technical Summary
CVE-2025-13856 is a stored cross-site scripting vulnerability in the Extra Post Images WordPress plugin by michaelcole1991. The flaw exists in all versions up to and including 1.0 due to improper neutralization of input in the 'id' parameter of the extra-images shortcode. Authenticated users with Contributor or higher privileges can inject arbitrary web scripts that persist and execute in the context of other users viewing the injected pages. This vulnerability is classified under CWE-79 and has a CVSS 3.1 base score of 6.4, reflecting a medium severity with network attack vector, low attack complexity, and privileges required.
Potential Impact
Successful exploitation allows an authenticated contributor or higher to inject persistent malicious scripts into pages, potentially leading to unauthorized actions performed in the context of other users who view the infected pages. The impact includes limited confidentiality and integrity loss but no availability impact. This could facilitate session hijacking, defacement, or other client-side attacks within the affected WordPress site.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict Contributor-level and higher access to trusted users only. Consider disabling or removing the Extra Post Images plugin if it is not essential. Monitor for plugin updates from the vendor that address this vulnerability.
CVE-2025-13856: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in michaelcole1991 Extra Post Images
Description
The Extra Post Images plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'id' parameter of the extra-images shortcode in all versions up to, and including, 1.0 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2025-13856 is a stored cross-site scripting vulnerability in the Extra Post Images WordPress plugin by michaelcole1991. The flaw exists in all versions up to and including 1.0 due to improper neutralization of input in the 'id' parameter of the extra-images shortcode. Authenticated users with Contributor or higher privileges can inject arbitrary web scripts that persist and execute in the context of other users viewing the injected pages. This vulnerability is classified under CWE-79 and has a CVSS 3.1 base score of 6.4, reflecting a medium severity with network attack vector, low attack complexity, and privileges required.
Potential Impact
Successful exploitation allows an authenticated contributor or higher to inject persistent malicious scripts into pages, potentially leading to unauthorized actions performed in the context of other users who view the infected pages. The impact includes limited confidentiality and integrity loss but no availability impact. This could facilitate session hijacking, defacement, or other client-side attacks within the affected WordPress site.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict Contributor-level and higher access to trusted users only. Consider disabling or removing the Extra Post Images plugin if it is not essential. Monitor for plugin updates from the vendor that address this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Wordfence
- Date Reserved
- 2025-12-01T20:30:56.208Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6933c71e11163305efef3de5
Added to database: 12/6/2025, 6:03:10 AM
Last enriched: 4/9/2026, 9:40:08 AM
Last updated: 5/10/2026, 2:27:18 AM
Views: 77
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