CVE-2025-23790 Overview
CVE-2025-23790 is a reflected Cross-Site Scripting (XSS) vulnerability in the wassereimer Easy Code Placement plugin for WordPress. The flaw stems from improper neutralization of user-supplied input during web page generation [CWE-79]. All plugin versions from initial release through 18.11 are affected.
Attackers can craft malicious URLs that, when clicked by an authenticated victim, execute arbitrary JavaScript in the victim's browser session. The scoped impact extends beyond the vulnerable component, allowing attackers to affect resources outside the plugin's security context.
Critical Impact
Successful exploitation enables session hijacking, credential theft, and unauthorized actions performed on behalf of WordPress administrators who interact with attacker-crafted links.
Affected Products
- wassereimer Easy Code Placement plugin for WordPress
- All versions from initial release through 18.11
- WordPress sites with the plugin installed and active
Discovery Timeline
- 2025-02-14 - CVE-2025-23790 published to NVD
- 2026-04-28 - Last updated in NVD database
Technical Details for CVE-2025-23790
Vulnerability Analysis
The vulnerability resides in the Easy Code Placement plugin's handling of HTTP request parameters. The plugin reflects user-controlled input back into rendered HTML responses without applying proper output encoding or input sanitization. This allows attacker-supplied JavaScript payloads to execute within the context of the targeted WordPress site.
Reflected XSS requires user interaction to succeed. An attacker must convince a victim, typically a logged-in administrator, to click a crafted link or visit a malicious page that issues the request. The Patchstack advisory documents the technical specifics of the affected request parameters.
Root Cause
The root cause is missing or insufficient output encoding when the plugin echoes request parameters into generated HTML. WordPress provides escaping helpers such as esc_html(), esc_attr(), and esc_url(), but these were not applied to the affected sinks. As a result, characters such as <, >, and " pass through unencoded.
Attack Vector
Exploitation occurs over the network through a crafted URL containing a malicious payload in a vulnerable parameter. The attacker delivers the link via phishing email, social media, or a compromised website. When an authenticated WordPress user follows the link, the injected script executes in their browser within the site's origin, enabling theft of session cookies, CSRF token extraction, or forced administrative actions.
The vulnerability mechanism is described in the Patchstack Vulnerability Report. No verified public proof-of-concept code is currently available.
Detection Methods for CVE-2025-23790
Indicators of Compromise
- Web server access logs containing requests with URL-encoded JavaScript payloads such as %3Cscript%3E, onerror=, or javascript: targeting Easy Code Placement plugin endpoints.
- Unexpected administrative actions in WordPress audit logs originating from administrator accounts shortly after they accessed external links.
- Outbound requests from administrator browsers to attacker-controlled domains carrying session cookies or nonces.
Detection Strategies
- Inspect HTTP query strings and POST bodies for plugin endpoints to flag payloads containing HTML tags, event handlers, or script schemes.
- Deploy a web application firewall (WAF) with OWASP Core Rule Set signatures targeting reflected XSS patterns.
- Correlate referer headers with subsequent privileged WordPress actions to identify suspicious link-driven activity.
Monitoring Recommendations
- Enable verbose logging on the WordPress site and forward logs to a centralized SIEM for analysis.
- Monitor browser Content Security Policy (CSP) violation reports for blocked inline script execution.
- Track plugin version inventory across hosted WordPress sites to identify instances still running version 18.11 or earlier.
How to Mitigate CVE-2025-23790
Immediate Actions Required
- Identify all WordPress sites running the Easy Code Placement plugin and inventory installed versions.
- Update Easy Code Placement to the latest patched release distributed by the vendor through the WordPress plugin repository.
- Rotate WordPress administrator passwords and invalidate active sessions if exploitation is suspected.
Patch Information
The vendor has addressed the issue in a release subsequent to version 18.11. Refer to the Patchstack Vulnerability Report for the fixed version and remediation guidance. Apply the update through the WordPress admin dashboard or via WP-CLI.
Workarounds
- Deactivate and remove the Easy Code Placement plugin until a patched version can be applied.
- Deploy a WAF rule to block requests containing suspicious script tags or event handlers targeting plugin endpoints.
- Implement a strict Content Security Policy that disallows inline scripts to reduce the impact of reflected payloads.
- Train administrators to avoid clicking unverified links pointing to their own WordPress installations.
# Update Easy Code Placement via WP-CLI
wp plugin update easy-code-placement
# Or deactivate and remove if no patch is available
wp plugin deactivate easy-code-placement
wp plugin uninstall easy-code-placement
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
