CVE-2026-11798: Super Socializer WordPress XSS Vulnerability

CVE-2026-11798 Overview

CVE-2026-11798 is a Reflected Cross-Site Scripting (XSS) vulnerability in the Super Socializer WordPress plugin, which provides social share, social login, and social comments functionality. The flaw affects all versions up to and including 7.14.5 and stems from insufficient input sanitization and output escaping on the heateor_mastodon_share parameter. Unauthenticated attackers can inject arbitrary web scripts that execute in a victim's browser when the victim clicks a crafted link. The vulnerability is classified under CWE-79.

Critical Impact
Unauthenticated attackers can execute arbitrary JavaScript in a victim's browser session, enabling session theft, credential harvesting, and administrative account takeover through social engineering.

Affected Products

Super Socializer plugin for WordPress — all versions through 7.14.5
WordPress sites using the Social Share, Social Login and Social Comments plugin by Heateor
Any WordPress deployment with the vulnerable plugin activated

Discovery Timeline

2026-07-08 - CVE-2026-11798 published to NVD
2026-07-08 - Last updated in NVD database

Technical Details for CVE-2026-11798

Vulnerability Analysis

The vulnerability is a Reflected Cross-Site Scripting flaw in the Super Socializer plugin's Mastodon sharing functionality. The plugin accepts user-supplied input through the heateor_mastodon_share parameter and returns that input in the HTTP response without applying adequate sanitization or output escaping. As a result, an attacker-controlled payload placed in the parameter is reflected into rendered HTML and executed by the browser.

Exploitation requires user interaction, typically a click on a crafted URL delivered through phishing, forum posts, or malicious advertisements. Because the injected script runs under the origin of the vulnerable WordPress site, it inherits access to authenticated session cookies, DOM contents, and any administrative functions available to the victim.

Root Cause

The root cause is missing input validation and output encoding in the plugin's helper functions. Source references point to helper.php at lines 1243 and 1246 in the 7.14.5 tag, where the heateor_mastodon_share value is processed. The application trusts request-supplied data and emits it into an HTML context without applying esc_html(), esc_attr(), or wp_kses() filtering appropriate to the output context.

Attack Vector

The attack is delivered over the network and requires no authentication. An attacker crafts a URL to the vulnerable WordPress site that includes a JavaScript payload in the heateor_mastodon_share query parameter. When a victim visits the link, the server reflects the payload into the response and the browser executes it. The scope-changed nature of the flaw allows the injected script to affect resources beyond the vulnerable component, including cookies and DOM state of the hosting site.

No verified public exploit code has been published. The vulnerability mechanism is described in the Wordfence Vulnerability Report and the WordPress Plugin Source Code.

Detection Methods for CVE-2026-11798

Indicators of Compromise

HTTP requests containing the heateor_mastodon_share parameter with values that include <script>, javascript:, onerror=, or URL-encoded equivalents such as %3Cscript%3E.
Referrer headers from unfamiliar domains delivering traffic directly to plugin endpoints.
Web server access logs showing repeated probing of Super Socializer endpoints from a single source IP.

Detection Strategies

Deploy a Web Application Firewall (WAF) rule that flags reflected input patterns and known XSS payload signatures on the heateor_mastodon_share parameter.
Inspect outbound HTML responses for script tags echoing request parameters, which indicates active reflection.
Correlate WordPress access logs with admin session activity to spot post-click credential theft or privilege changes.

Monitoring Recommendations

Enable verbose logging on WordPress and archive HTTP query strings for retrospective analysis.
Monitor administrator account activity for unexpected plugin installations, user role changes, or option table modifications following XSS attempts.
Alert on anomalous JavaScript execution and cookie exfiltration attempts using browser-side Content Security Policy (CSP) reporting.

How to Mitigate CVE-2026-11798

Immediate Actions Required

Update the Super Socializer plugin to a version later than 7.14.5 once a patched release is available from the vendor.
If no patched version is available, deactivate and remove the plugin until a fix is released.
Rotate WordPress administrator credentials and invalidate active sessions if suspicious heateor_mastodon_share requests appear in logs.

Patch Information

At the time of publication, remediation guidance is tracked in the Wordfence Vulnerability Report. Site operators should monitor the plugin repository for a release that adds proper sanitization to the affected parameter, and apply it as soon as it is published.

Workarounds

Configure a WAF rule to block or sanitize requests containing script-like content in the heateor_mastodon_share parameter.
Enforce a strict Content Security Policy that disallows inline scripts and restricts script sources to trusted origins.
Restrict access to WordPress admin URLs by IP address to limit the impact of session hijacking through reflected XSS.

bash

# Example ModSecurity rule to block XSS payloads in the vulnerable parameter
SecRule ARGS:heateor_mastodon_share "@rx (?i)(<script|javascript:|onerror=|onload=)" \
    "id:1026011798,\
     phase:2,\
     deny,\
     status:403,\
     msg:'CVE-2026-11798 Super Socializer XSS attempt blocked',\
     tag:'application-multi',\
     tag:'attack-xss'"