CVE-2025-27350 Overview
CVE-2025-27350 is a reflected Cross-Site Scripting (XSS) vulnerability in the Hugh Mungus Vice Versa WordPress plugin. The flaw stems from improper neutralization of user input during web page generation [CWE-79]. It affects all versions of Vice Versa up to and including 2.2.3.
Attackers can craft malicious URLs that, when followed by an authenticated user, execute arbitrary JavaScript in the victim's browser. The vulnerability has a scope-changed CVSS impact, meaning the injected payload affects resources beyond the vulnerable component.
Critical Impact
A successful attack runs attacker-controlled JavaScript in the victim's authenticated WordPress session, enabling session theft, content manipulation, and pivoting to administrative actions.
Affected Products
- Hugh Mungus Vice Versa WordPress Plugin versions through 2.2.3
- WordPress sites with the vice-versa plugin installed and active
- All Vice Versa releases prior to a fixed version (no patched version listed in the advisory)
Discovery Timeline
- 2025-04-10 - CVE-2025-27350 published to NVD
- 2026-04-23 - Last updated in NVD database
Technical Details for CVE-2025-27350
Vulnerability Analysis
The Vice Versa plugin reflects user-supplied input into HTTP responses without performing adequate output encoding or input sanitization. When a victim visits a crafted URL, the unsanitized parameter is rendered into the generated HTML, where the browser interprets it as executable script content.
Because the CVSS scope is changed, payloads executing in the WordPress context can reach data and functionality belonging to other security authorities, such as the administrative dashboard or browser-stored credentials. User interaction is required, typically delivered via phishing links, forum posts, or malvertising directed at WordPress administrators.
Root Cause
The root cause is missing or insufficient HTML encoding of request parameters before they are echoed into the rendered page. The plugin treats untrusted GET or POST data as safe HTML rather than passing it through WordPress sanitization functions such as esc_html(), esc_attr(), or wp_kses().
Attack Vector
Exploitation proceeds over the network and requires no authentication. An attacker constructs a URL containing a JavaScript payload in a vulnerable parameter and lures a privileged user into visiting it. On render, the browser executes the payload under the WordPress site's origin, allowing cookie theft, CSRF-style actions, and arbitrary DOM manipulation. No verified proof-of-concept code is published; see the Patchstack advisory for additional technical context.
Detection Methods for CVE-2025-27350
Indicators of Compromise
- HTTP request logs containing <script>, javascript:, or encoded variants in query parameters targeting Vice Versa plugin endpoints
- Referer headers from external phishing domains directing users to plugin URLs with reflective parameters
- Unexpected outbound requests from administrator browser sessions immediately after plugin page visits
Detection Strategies
- Inspect web server access logs for query strings containing HTML or JavaScript metacharacters such as <, >, ", and onerror=
- Deploy a Web Application Firewall (WAF) ruleset for reflected XSS targeting WordPress plugin parameters
- Correlate XSS-pattern requests with subsequent administrative actions in WordPress audit logs
Monitoring Recommendations
- Enable WordPress activity logging for plugin pages and administrator account changes
- Monitor browser endpoint telemetry for anomalous script execution originating from trusted WordPress domains
- Track plugin inventory across managed WordPress hosts to identify exposed Vice Versa installations
How to Mitigate CVE-2025-27350
Immediate Actions Required
- Identify all WordPress sites with the Vice Versa plugin installed and confirm version 2.2.3 or earlier
- Deactivate and remove the plugin until a fixed version is confirmed available
- Apply WAF virtual patching rules to block reflected XSS payloads against vice-versa plugin paths
Patch Information
No fixed version is listed in the advisory at the time of publication. Administrators should monitor the Patchstack advisory and the WordPress plugin repository for an update beyond 2.2.3.
Workarounds
- Disable the Vice Versa plugin on all WordPress sites until a vendor patch is released
- Enforce a Content Security Policy (CSP) that restricts inline script execution on WordPress front-end and admin pages
- Require administrators to use isolated browser profiles when managing WordPress to limit credential exposure
- Train privileged users to avoid clicking unsolicited links pointing to their own WordPress sites
# Example: list and deactivate the Vice Versa plugin via WP-CLI
wp plugin list --name=vice-versa --fields=name,status,version
wp plugin deactivate vice-versa
wp plugin delete vice-versa
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
