CVE-2025-58790: Kiwi Social Share Stored XSS Vulnerability

CVE-2025-58790 Overview

CVE-2025-58790 is a stored Cross-Site Scripting (XSS) vulnerability affecting the WPKube Kiwi Social Share plugin for WordPress. The flaw exists in versions up to and including 2.1.8. Attackers with low-privilege authenticated access can inject malicious JavaScript that persists in the application and executes in the browsers of other users who view the affected pages. The vulnerability is categorized under [CWE-79] for improper neutralization of input during web page generation.

Critical Impact
Authenticated attackers can inject persistent JavaScript payloads that execute in the context of victim browsers, potentially leading to session theft, administrative action forgery, or redirection to attacker-controlled infrastructure.

Affected Products

WPKube Kiwi Social Share plugin for WordPress
All versions from initial release through 2.1.8
WordPress sites with the Kiwi plugin installed and activated

Discovery Timeline

2025-09-05 - CVE-2025-58790 published to the National Vulnerability Database
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-58790

Vulnerability Analysis

The Kiwi Social Share plugin fails to properly sanitize user-supplied input before rendering it in web pages generated by WordPress. This results in a stored XSS condition where malicious payloads are persisted in the database and later delivered to any user visiting an affected page. Exploitation requires an authenticated user with low privileges and involves user interaction from a victim who loads the affected content. Successful attacks can hijack sessions, perform actions on behalf of authenticated users, or deliver secondary payloads.

Root Cause

The root cause is improper neutralization of input during web page generation. Plugin code accepts input from an authenticated user and writes it into HTML output without applying appropriate escaping or sanitization. WordPress provides functions such as esc_html(), esc_attr(), and wp_kses() for context-aware output encoding, but the affected code paths in Kiwi Social Share versions through 2.1.8 do not apply them consistently.

Attack Vector

The attack is network-reachable and requires low-level authentication combined with victim interaction. An attacker submits a crafted payload through a plugin input field that stores data server-side. When another user, potentially an administrator, loads a page that renders the stored data, the injected script executes with the victim's session context. Because the scope is changed, the impact can extend beyond the vulnerable component to other parts of the WordPress site. See the Patchstack Vulnerability Report for additional technical detail.

Detection Methods for CVE-2025-58790

Indicators of Compromise

Unexpected <script> tags, event handlers such as onerror or onload, or javascript: URIs stored in WordPress database fields associated with the Kiwi Social Share plugin
Outbound requests from browsers loading WordPress pages to unknown external domains hosting JavaScript
Administrator accounts performing actions inconsistent with normal usage patterns after viewing plugin-rendered pages

Detection Strategies

Audit WordPress database tables and plugin option storage for HTML or JavaScript markup in fields expected to contain plain text
Deploy a Web Application Firewall (WAF) rule set that flags XSS payload patterns targeting WordPress plugin endpoints
Review web server access logs for POST requests to Kiwi plugin endpoints containing encoded script fragments or unusual payload lengths

Monitoring Recommendations

Enable Content Security Policy (CSP) reporting to identify script execution violations on WordPress front-end pages
Monitor authenticated low-privilege user accounts for anomalous submissions to plugin-managed forms and settings
Alert on new outbound network connections initiated from browser sessions loading WordPress admin or public pages

How to Mitigate CVE-2025-58790

Immediate Actions Required

Identify all WordPress installations using the Kiwi Social Share plugin and confirm the installed version
Restrict low-privilege account creation and review existing contributor and subscriber accounts for suspicious activity
Purge any stored content in plugin-managed fields that contains unexpected HTML or scripting constructs

Patch Information

Review the Patchstack Vulnerability Report for the vendor's remediation guidance. Upgrade to a version later than 2.1.8 when the vendor publishes a fixed release. If no patched version is available, treat the plugin as unmaintained and plan for removal.

Workarounds

Deactivate and remove the Kiwi Social Share plugin until a fixed version is published
Deploy a WAF with rules that block XSS payloads targeting WordPress plugin endpoints
Enforce a strict Content Security Policy that disallows inline scripts and restricts script sources to trusted origins
Limit account privileges so that only trusted users can submit content processed by the affected plugin

bash

# Example: disable the plugin via WP-CLI until a fixed release is available
wp plugin deactivate kiwi-social-share
wp plugin delete kiwi-social-share