CVE-2025-5703 Overview
The StageShow plugin for WordPress contains a Stored Cross-Site Scripting (XSS) vulnerability [CWE-79] in the anchor parameter. All versions up to and including 10.0.3 are affected. The flaw stems from insufficient input sanitization and output escaping in the plugin's sales handling code. Authenticated attackers with Contributor-level access or above can inject arbitrary JavaScript into pages. The injected scripts execute in the browser of any user who visits the affected page. This creates opportunities for session theft, forced redirects, and privilege escalation through administrator interaction.
Critical Impact
Contributor-level users can persist arbitrary JavaScript into WordPress pages, executing in the context of any visitor including administrators.
Affected Products
- StageShow plugin for WordPress, versions up to and including 10.0.3
- Vendor: stageshow_project
- Deployment: WordPress sites with the StageShow plugin installed and active
Discovery Timeline
- 2025-06-06 - CVE-2025-5703 published to the National Vulnerability Database (NVD)
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-5703
Vulnerability Analysis
The vulnerability resides in the StageShow sales plugin component. The anchor parameter is accepted from authenticated users and stored, then rendered into page output without adequate sanitization or contextual escaping. Because the payload is persisted server-side, it executes for every subsequent viewer of the injected page.
Exploitation requires an authenticated session at Contributor level or higher. WordPress sites that allow open Contributor registration or use Contributor roles for external content workflows expand the attack surface. The Scope change indicated by the CVSS vector reflects the browser-side execution boundary, meaning the injected script can affect resources beyond the vulnerable plugin itself, such as the WordPress admin interface.
Root Cause
The root cause is missing input sanitization on the anchor parameter combined with absent output escaping when the value is rendered back into HTML. WordPress provides sanitize_text_field() for input and esc_attr() or esc_html() for output, but the affected code path in stageshowlib_salesplugin.php does not apply appropriate filtering. See the WordPress Sales Plugin Code for the vulnerable location.
Attack Vector
An attacker authenticates to WordPress with a Contributor account, then submits a crafted anchor parameter containing HTML or JavaScript payloads through the StageShow plugin interface. The payload is stored and later rendered into a page. When an administrator or other privileged user views the page, the script executes with that user's session context. Administrator victims can trigger account creation, plugin modification, or arbitrary content changes. Refer to the Wordfence Vulnerability Report for additional analysis.
Detection Methods for CVE-2025-5703
Indicators of Compromise
- Unexpected <script>, onerror, or onload attributes stored in WordPress post or page content associated with StageShow
- Outbound requests from browsers viewing WordPress pages to unfamiliar domains referenced by injected scripts
- New administrator accounts or plugin installations that correlate with page views by privileged users
- Contributor-level accounts submitting content with unusual formatting or encoded characters in StageShow fields
Detection Strategies
- Review the WordPress wp_posts table and StageShow-related tables for HTML event handlers or <script> tags in stored anchor values
- Deploy web application firewall (WAF) rules that flag script payloads submitted to StageShow endpoints
- Enable a Content Security Policy (CSP) that reports script violations to a central logging endpoint
- Correlate Contributor account activity with subsequent administrator page views in access logs
Monitoring Recommendations
- Log and alert on all Contributor-level content submissions to StageShow endpoints for retrospective review
- Monitor WordPress audit logs for privileged actions occurring shortly after page rendering events
- Track browser CSP violation reports to identify successful injection attempts against live pages
How to Mitigate CVE-2025-5703
Immediate Actions Required
- Update the StageShow plugin to a version later than 10.0.3 once the vendor publishes a fix
- Audit Contributor and higher-privileged accounts and remove accounts that are unnecessary or unverified
- Inspect existing StageShow page content for injected scripts and remove malicious payloads
- Rotate administrator credentials if any indicators of compromise are observed
Patch Information
At the time of publication, no fixed version is documented in the enriched CVE data. Monitor the WordPress StageShow Developer Info page and the Wordfence Vulnerability Report for release announcements. Apply the update across all WordPress installations that use the plugin.
Workarounds
- Restrict Contributor and higher roles to trusted users only and disable open registration for these roles
- Deactivate the StageShow plugin until a patched version is available if the plugin is not business-critical
- Deploy a WAF rule that blocks script tags and JavaScript event handlers in requests targeting StageShow parameters
- Enforce a strict Content Security Policy that disallows inline scripts on pages rendered by the plugin
# Example WordPress CLI commands to audit and disable the plugin
wp plugin status stageshow
wp plugin deactivate stageshow
wp user list --role=contributor --fields=ID,user_login,user_email,user_registered
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
