CVE-2025-48256: Import Social Events Stored XSS Vulnerability

CVE-2025-48256 Overview

CVE-2025-48256 is a stored cross-site scripting (XSS) vulnerability in the Xylus Themes Import Social Events plugin for WordPress, distributed as import-facebook-events. The flaw affects all versions up to and including 1.8.5. An authenticated attacker with low privileges can inject persistent JavaScript payloads that execute in a victim's browser when the affected page is rendered. The vulnerability is classified under CWE-79, improper neutralization of input during web page generation. Successful exploitation requires user interaction and produces a scope change, allowing the payload to affect resources beyond the vulnerable component.

Critical Impact
Stored XSS enables authenticated low-privilege users to inject persistent scripts that run in administrator or visitor browser sessions, potentially leading to session theft, privilege escalation, or defacement of WordPress admin surfaces.

Affected Products

Xylus Themes Import Social Events (plugin slug import-facebook-events)
All versions from initial release through 1.8.5
WordPress installations with the plugin activated

Discovery Timeline

2025-05-19 - CVE-2025-48256 published to the National Vulnerability Database
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-48256

Vulnerability Analysis

The vulnerability resides in the Import Social Events plugin's handling of user-supplied input during event import and rendering workflows. Input passed to the plugin is stored in the WordPress database without sufficient sanitization or contextual output encoding. When the stored data is later rendered in a page or administrative view, embedded HTML and JavaScript execute in the browser of any user who loads the affected view.

Because the payload persists in the database, it triggers on every subsequent view of the affected resource. The attack requires an authenticated session with contributor-level access or similar low privileges, and it requires a victim to load the rendered content. The scope change component indicates the injected script can influence resources outside the plugin's security boundary, including the WordPress administrative interface.

Root Cause

The root cause is improper neutralization of input during web page generation (CWE-79). The plugin fails to apply WordPress sanitization primitives such as sanitize_text_field() on input and esc_html(), esc_attr(), or wp_kses_post() on output. As a result, attacker-controlled markup passes through storage and rendering without being converted to safe HTML entities.

Attack Vector

An authenticated attacker submits event data through a plugin form or import interface containing a crafted JavaScript payload. The payload is stored in the WordPress database. When an administrator or visitor loads the page that renders the stored event data, the browser parses and executes the injected script in the context of the WordPress site.

The vulnerability manifests during output rendering of stored event fields. Refer to the Patchstack XSS Vulnerability Analysis for technical detail on the vulnerable parameter.

Detection Methods for CVE-2025-48256

Indicators of Compromise

WordPress posts, event entries, or plugin metadata containing <script>, onerror=, onload=, or javascript: sequences in fields owned by import-facebook-events.
Unexpected outbound requests from administrator browsers to attacker-controlled domains shortly after loading event pages.
New or modified WordPress administrator accounts created by low-privilege users following event imports.

Detection Strategies

Query the wp_posts and wp_postmeta tables for entries associated with the Import Social Events plugin that contain HTML event handlers or script tags.
Deploy web application firewall rules that flag POST requests to plugin endpoints carrying script-like payloads in event title, description, or location fields.
Review WordPress audit logs for event creation or import actions performed by contributor and author accounts.

Monitoring Recommendations

Monitor plugin version inventory across managed WordPress sites and flag any installation of import-facebook-events at version 1.8.5 or earlier.
Enable Content Security Policy (CSP) reporting to capture inline script execution attempts on WordPress admin and public pages.
Track browser telemetry from administrator workstations for anomalous script activity on the WordPress admin domain.

How to Mitigate CVE-2025-48256

Immediate Actions Required

Identify all WordPress sites running the Xylus Themes Import Social Events plugin at version 1.8.5 or earlier.
Update the plugin to a fixed version once released by the vendor, or deactivate and remove it until a patch is available.
Audit existing event records and plugin-generated content for stored payloads and remove any malicious entries.
Rotate credentials for administrator accounts that may have loaded compromised pages.

Patch Information

At the time of the NVD entry, versions through 1.8.5 are affected. Consult the Patchstack advisory for the most current fixed-version guidance from Xylus Themes.

Workarounds

Restrict plugin access to trusted high-privilege users only by adjusting WordPress role capabilities.
Deploy a WAF ruleset that blocks HTML event handlers and <script> tags in requests targeting plugin endpoints.
Apply a Content Security Policy that disallows inline scripts on WordPress admin and public pages.
Disable the plugin on sites that do not actively use Facebook or social event imports.

bash

# Configuration example: identify vulnerable installations via WP-CLI
wp plugin list --name=import-facebook-events --fields=name,status,version
wp plugin deactivate import-facebook-events
# After a fixed version is published:
wp plugin update import-facebook-events