CVE-2025-6716 Overview
CVE-2025-6716 is a Stored Cross-Site Scripting (XSS) vulnerability in the Contest Gallery plugin for WordPress. The plugin, marketed for photo, file, and social media uploads with PayPal and Stripe commerce features, fails to properly sanitize and escape the upload[1][title] parameter. All versions up to and including 26.0.8 are affected. Authenticated users with Author-level privileges or higher can inject arbitrary JavaScript that executes in the browser of any user visiting an affected page. The flaw is tracked under CWE-79.
Critical Impact
Authenticated attackers with Author access can inject persistent JavaScript that executes in administrator and visitor sessions, enabling session hijacking, privilege escalation, and content tampering.
Affected Products
- Contest Gallery plugin for WordPress — versions up to and including 26.0.8
- WordPress sites that permit Author-level or higher user registration
- Any site visitor rendering a page containing an injected gallery entry
Discovery Timeline
- 2025-07-11 - CVE-2025-6716 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-6716
Vulnerability Analysis
The vulnerability resides in the handling of the upload[1][title] parameter during gallery entry submission. User-supplied title content is stored in the WordPress database and later rendered without adequate HTML escaping. When a victim loads a page containing the injected entry, the browser executes the attacker-controlled payload in the context of the site's origin.
Stored XSS in a WordPress plugin that targets Author-level actors is significant because Authors can create and publish posts. An injected payload can therefore reach administrators who review submissions, Editors who moderate content, and public visitors who browse galleries.
Typical consequences include session cookie theft, forced administrative actions through CSRF-style requests from authenticated sessions, injection of SEO spam, and redirection of visitors to malicious domains. On a vulnerable site, a single Author account is sufficient to establish persistent client-side control.
Root Cause
The plugin accepts the upload[1][title] parameter and persists it without applying WordPress sanitization helpers such as sanitize_text_field() on input or esc_html() on output. The lack of contextual output escaping during rendering allows HTML and JavaScript to execute instead of displaying as text.
Attack Vector
Exploitation requires an authenticated session with Author-level or higher capabilities. The attacker submits a gallery upload with a crafted upload[1][title] value containing JavaScript. The payload persists in the database and triggers on every subsequent view of the affected page. Describe the attack chain in prose only — no verified public proof-of-concept code is referenced in the advisory. See the Wordfence Vulnerability Report for additional detail.
Detection Methods for CVE-2025-6716
Indicators of Compromise
- Gallery entries whose title fields contain <script>, onerror=, onload=, javascript:, or encoded equivalents
- Unexpected outbound requests from administrator browsers to unfamiliar domains after viewing gallery pages
- New or modified administrator accounts following Author-level activity
- WordPress audit log entries showing uploads from recently created low-privilege accounts
Detection Strategies
- Query the wp_posts and plugin-specific tables for stored title fields matching HTML tag or event-handler patterns
- Deploy a web application firewall (WAF) rule to flag upload[1][title] values containing HTML markup
- Inspect server access logs for POST requests to Contest Gallery upload endpoints from Author-level accounts
Monitoring Recommendations
- Alert on new WordPress user registrations granted Author role or higher
- Monitor administrator session activity for anomalous API calls originating from gallery page views
- Review Content Security Policy (CSP) violation reports for inline script execution on gallery pages
How to Mitigate CVE-2025-6716
Immediate Actions Required
- Update the Contest Gallery plugin to a version later than 26.0.8 that addresses this issue
- Audit all existing gallery entries for stored script payloads and remove suspicious titles
- Review and reduce the number of accounts with Author-level or higher capabilities
- Rotate credentials and session tokens for administrators who may have visited injected pages
Patch Information
The vendor published a fix referenced in the WordPress Plugin Change Log. Site administrators should apply the latest plugin release through the WordPress admin console or wp-cli.
Workarounds
- Disable the Contest Gallery plugin until patching is completed
- Restrict user registration and prevent assignment of Author or higher roles to untrusted users
- Enforce a strict Content Security Policy that disallows inline scripts on pages rendering gallery content
- Place the site behind a WAF with a rule set that strips HTML from the upload[1][title] parameter
# Configuration example: update the plugin via wp-cli
wp plugin update contest-gallery --version=latest
wp plugin list --name=contest-gallery --fields=name,status,version
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
