CVE-2026-15253 Overview
CVE-2026-15253 is a stored Cross-Site Scripting (XSS) vulnerability [CWE-79] in the Easy Media Replace WordPress plugin through version 0.2.0. The plugin fails to sanitize and escape attachment titles before rendering them within an HTML attribute in the media library list view. Authenticated users with Author-level privileges or above can inject arbitrary JavaScript into attachment titles. When a higher-privileged user such as an Editor or Administrator views the media library, the injected script executes in their browser context. Successful exploitation can lead to session theft, privileged action abuse, and full site compromise through administrator account takeover.
Critical Impact
Authenticated attackers with Author role can execute arbitrary JavaScript in an administrator's browser, enabling account takeover and site compromise.
Affected Products
- Easy Media Replace WordPress plugin versions through 0.2.0
- WordPress installations where the plugin is active
- Sites permitting Author-level or higher user registrations
Discovery Timeline
- 2026-08-19 - CVE-2026-15253 published to NVD
- 2026-08-19 - Last updated in NVD database
Technical Details for CVE-2026-15253
Vulnerability Analysis
The vulnerability resides in how the Easy Media Replace plugin renders attachment titles in the media library list view. The plugin outputs the attachment title inside an HTML attribute without applying proper output encoding. Because escaping is missing, an attacker can break out of the attribute context using quote characters and inject arbitrary JavaScript.
The attack requires authentication with the Author role or higher, which raises the privilege bar. However, many WordPress deployments include multiple contributors, making this reachable in real-world environments. The stored nature of the payload means the script fires automatically each time a privileged user browses the media library.
User interaction is required in the form of the victim visiting the media library. Once triggered, the payload runs with the victim's session, allowing the attacker to create new administrator accounts, install malicious plugins, or exfiltrate sensitive site data.
Root Cause
The root cause is missing output escaping. The plugin passes user-controlled attachment title data directly into an HTML attribute without applying WordPress functions such as esc_attr(). This violates standard WordPress secure coding practice, which mandates context-appropriate escaping at the point of output.
Attack Vector
The attack vector is network-based and requires an authenticated Author-level account. The attacker uploads or edits a media attachment and sets the title to a payload that breaks out of the HTML attribute. When an administrator or editor loads the media library list view, the browser parses the malformed attribute and executes the attacker's script. See the WPScan Vulnerability Report for additional technical detail.
Detection Methods for CVE-2026-15253
Indicators of Compromise
- Attachment titles containing HTML tags, quote characters, or JavaScript event handlers such as onerror, onclick, or onmouseover.
- Unexpected creation of new administrator accounts shortly after media library access by privileged users.
- Outbound HTTP requests from administrator browser sessions to unfamiliar external domains after visiting /wp-admin/upload.php.
Detection Strategies
- Audit the wp_posts table for attachments where post_title contains suspicious characters like <, ", or javascript:.
- Review WordPress activity logs for attachment title modifications performed by Author or Contributor accounts.
- Deploy a Web Application Firewall rule to inspect attachment metadata submissions for XSS payloads.
Monitoring Recommendations
- Monitor administrative endpoints under /wp-admin/ for anomalous JavaScript execution and unexpected form submissions.
- Alert on privilege changes, new user creation, and plugin installation events following media library access.
- Track browser-side errors and Content Security Policy violation reports originating from the media library view.
How to Mitigate CVE-2026-15253
Immediate Actions Required
- Deactivate the Easy Media Replace plugin until a patched version is available.
- Restrict Author-level and higher accounts to trusted users and review the current user roster.
- Audit existing media attachment titles for injected script content and sanitize any suspicious entries.
Patch Information
At the time of publication, no fixed version has been identified in the referenced advisory. The vulnerability affects Easy Media Replace through version 0.2.0. Monitor the WPScan Vulnerability Report and the plugin's WordPress.org listing for patch availability.
Workarounds
- Remove or deactivate the plugin from all WordPress sites where it is installed.
- Enforce a strict Content Security Policy that disallows inline script execution in the WordPress admin interface.
- Limit media library access to Administrator accounts using role management plugins until the vulnerability is patched.
- Require multi-factor authentication for all accounts with Editor or Administrator privileges to reduce impact of session hijacking.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
