CVE-2024-35718 Overview
CVE-2024-35718 is a reflected cross-site scripting (XSS) vulnerability in the Tribulant Newsletters plugin for WordPress. The flaw affects all versions of the plugin from an unspecified starting release through 4.9.5. It results from improper neutralization of user input during web page generation, allowing attackers to inject arbitrary JavaScript that executes in a victim's browser. Exploitation requires a target user to interact with a crafted link, typically through phishing or social engineering.
Critical Impact
An attacker can execute arbitrary JavaScript in the context of a victim's browser session, enabling session data theft, credential harvesting, and unauthorized actions on the WordPress site.
Affected Products
- Tribulant Newsletters plugin for WordPress
- All versions up to and including 4.9.5
- WordPress sites with the Newsletters Lite plugin installed
Discovery Timeline
- 2024-06-08 - CVE-2024-35718 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2024-35718
Vulnerability Analysis
The vulnerability is a reflected cross-site scripting flaw classified under [CWE-79]. Tribulant Newsletters accepts input from HTTP request parameters and reflects that input back into rendered HTML without sufficient sanitization or output encoding. When a victim visits a crafted URL, the injected payload executes in the browser under the origin of the vulnerable WordPress site.
Reflected XSS in a newsletter plugin is particularly relevant because such plugins commonly render preview pages, unsubscribe confirmations, and tracking parameters that echo user-supplied data. An attacker who successfully lures an administrator to a malicious link can hijack the session, create rogue accounts, or modify plugin settings. Against subscribers, the same primitive supports credential phishing and drive-by redirection.
Root Cause
The root cause is missing input validation and output encoding on one or more request parameters processed by the plugin prior to version 4.9.6. User-controlled data flows into HTML context without being escaped through WordPress helpers such as esc_html(), esc_attr(), or wp_kses(). This allows raw markup, including <script> elements and event-handler attributes, to be rendered as executable content.
Attack Vector
Exploitation is network-based and requires user interaction. An attacker crafts a URL that targets a vulnerable endpoint of the Newsletters plugin and embeds a JavaScript payload in a reflected parameter. The victim receives the link through email, chat, or a malicious website. When the victim clicks the link, the payload executes in the security context of the WordPress site. Because the scope is changed, the injected script can access data or perform actions across the affected origin.
No verified public proof-of-concept code is available. See the Patchstack Vulnerability Report for additional technical context.
Detection Methods for CVE-2024-35718
Indicators of Compromise
- HTTP request logs containing URL-encoded <script>, onerror=, onload=, or javascript: payloads targeting Newsletters plugin endpoints
- Referer headers from external domains pointing users to Newsletters plugin URLs with unusually long query strings
- Unexpected administrator account creation or plugin configuration changes shortly after a logged XSS request
Detection Strategies
- Inspect web server access logs for reflected query parameters that contain HTML tags or JavaScript event handlers
- Deploy a web application firewall rule that flags XSS signatures on requests to Newsletters plugin paths
- Correlate suspicious requests with subsequent authenticated admin actions from the same client IP or session
Monitoring Recommendations
- Enable WordPress audit logging for administrator sessions, user creation, and plugin setting modifications
- Monitor outbound requests from browser sessions on WordPress admin pages for connections to unknown domains
- Track the installed version of the Tribulant Newsletters plugin across managed WordPress instances
How to Mitigate CVE-2024-35718
Immediate Actions Required
- Upgrade the Tribulant Newsletters plugin to a version later than 4.9.5 on all WordPress sites
- Audit administrator accounts and revoke unrecognized users or API keys created during the exposure window
- Force password resets for privileged WordPress accounts if suspicious activity is observed in logs
Patch Information
Refer to the Patchstack Vulnerability Report for the fixed release and vendor guidance. Upgrade to the first patched release of the plugin published after version 4.9.5 and verify the version reported by WordPress after the update.
Workarounds
- Deactivate the Tribulant Newsletters plugin until the site can be patched
- Apply web application firewall rules that block requests containing HTML or JavaScript metacharacters in Newsletters plugin parameters
- Enforce a strict Content Security Policy that disallows inline scripts on WordPress pages rendered by the plugin
# Example WP-CLI commands to check and update the plugin
wp plugin get newsletters --field=version
wp plugin update newsletters
wp plugin deactivate newsletters # temporary workaround if patch cannot be applied
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
