CVE-2025-26931 Overview
CVE-2025-26931 is a Cross-Site Request Forgery (CSRF) vulnerability in the Tribulant Gallery Voting WordPress plugin developed by Tribulant Software. The flaw affects all versions up to and including 1.2.1. An attacker can leverage the CSRF weakness to inject persistent JavaScript payloads, producing Stored Cross-Site Scripting (XSS) in the plugin's interface. Exploitation requires user interaction, typically tricking an authenticated administrator into visiting an attacker-controlled page. The vulnerability is tracked under CWE-352 and carries an EPSS probability of 0.082%.
Critical Impact
A successful attack stores attacker-controlled JavaScript in the WordPress site, enabling session hijacking, administrator account takeover, and arbitrary actions in the victim's browser context.
Affected Products
- Tribulant Gallery Voting WordPress plugin versions through 1.2.1
- WordPress sites with the gallery-voting plugin installed and active
- Administrative users authenticated to vulnerable WordPress instances
Discovery Timeline
- 2025-02-25 - CVE-2025-26931 published to NVD
- 2026-04-23 - Last updated in NVD database
Technical Details for CVE-2025-26931
Vulnerability Analysis
The Tribulant Gallery Voting plugin fails to validate the origin and authenticity of state-changing requests. The plugin does not enforce WordPress nonce verification on form submissions or AJAX endpoints that accept user-supplied input. An attacker abuses this gap by crafting a malicious page that submits a forged request to a vulnerable site when an authenticated administrator visits it. The forged request stores attacker-controlled content, which the plugin later renders without sufficient output encoding. The result is a Stored XSS payload that executes whenever an administrator or other authenticated user views the affected page. Because the injected script runs with the victim's privileges, the attacker can steal authentication cookies, modify site content, create new administrative accounts, or pivot to deeper compromise of the WordPress instance.
Root Cause
The root cause is the absence of anti-CSRF tokens on requests that modify gallery voting data. WordPress provides the wp_nonce_field() and check_admin_referer() primitives for exactly this purpose, but the plugin does not call them on the vulnerable endpoints. The missing token check is compounded by inadequate output sanitization of stored values, allowing HTML and script content to persist and execute.
Attack Vector
The attack vector is network-based and requires user interaction. An attacker hosts a page containing a hidden form or JavaScript that auto-submits a request to the target WordPress site. When a logged-in administrator visits the malicious page, the browser sends the request along with valid session cookies. The plugin processes the request as legitimate, storing the malicious payload. See the Patchstack WordPress Vulnerability advisory for additional technical context.
Detection Methods for CVE-2025-26931
Indicators of Compromise
- Unexpected <script> tags, event handlers, or encoded JavaScript in gallery voting records stored in the WordPress database
- New or modified WordPress administrator accounts not created by legitimate workflows
- HTTP POST requests to gallery-voting plugin endpoints missing standard WordPress _wpnonce parameters
- Outbound connections from administrator browsers to unfamiliar domains shortly after visiting external links
Detection Strategies
- Inspect the wp_options, wp_postmeta, and plugin-specific tables for HTML or JavaScript content within gallery voting fields
- Review web server access logs for POST requests to plugin endpoints originating from external Referer headers
- Monitor WordPress audit logs for unexpected configuration or content changes attributed to administrator accounts
Monitoring Recommendations
- Enable a Web Application Firewall (WAF) ruleset that flags requests to WordPress admin endpoints lacking valid nonces
- Alert on creation of new administrator accounts or role escalations within WordPress
- Capture browser-side telemetry on administrator workstations to identify script execution originating from the WordPress admin interface
How to Mitigate CVE-2025-26931
Immediate Actions Required
- Deactivate the Tribulant Gallery Voting plugin until a patched version is installed
- Audit gallery voting records and remove any entries containing HTML or JavaScript content
- Force a password reset and session invalidation for all WordPress administrator accounts
- Restrict administrator browsing habits and enforce separation between privileged sessions and general web browsing
Patch Information
At the time of publication, the Patchstack advisory lists versions through 1.2.1 as affected. Administrators should upgrade to a vendor-supplied fixed release once available and confirm the patched version on the WordPress plugin page.
Workarounds
- Remove the gallery-voting plugin directory from wp-content/plugins/ if patching is not immediately feasible
- Deploy a WAF rule blocking POST requests to plugin endpoints that lack a valid _wpnonce token
- Apply a Content Security Policy (CSP) that restricts inline script execution within the WordPress admin interface
# Disable the vulnerable plugin via WP-CLI
wp plugin deactivate gallery-voting
wp plugin delete gallery-voting
# Verify removal
wp plugin list --status=active | grep gallery-voting
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
