CVE-2025-8400: Image Gallery WordPress Plugin XSS Flaw

CVE-2025-8400 Overview

CVE-2025-8400 is a Reflected Cross-Site Scripting (XSS) vulnerability in the Bee Quick Gallery (Image Gallery) plugin for WordPress. The flaw affects all plugin versions up to and including 1.0.0. It stems from insufficient input sanitization and output escaping in plugin request handlers. Unauthenticated attackers can craft malicious URLs that inject arbitrary JavaScript into pages rendered by the plugin. When a victim clicks the crafted link, the injected script executes in the victim's browser session, under the origin of the vulnerable WordPress site. The issue is tracked under CWE-79: Improper Neutralization of Input During Web Page Generation.

Critical Impact
Unauthenticated attackers can execute arbitrary JavaScript in a victim's browser session, enabling session theft, credential harvesting, or administrative action hijacking on WordPress sites running the Bee Quick Gallery plugin.

Affected Products

WordPress Bee Quick Gallery (Image Gallery) plugin — all versions through 1.0.0
WordPress sites with the plugin active and reachable over HTTP/HTTPS
Any browser-based user visiting a crafted URL served by an affected site

Discovery Timeline

2025-08-02 - CVE-2025-8400 published to the National Vulnerability Database
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-8400

Vulnerability Analysis

The Bee Quick Gallery plugin accepts user-supplied input through request parameters and reflects those values into HTML responses without applying proper sanitization or context-appropriate output escaping. Because the vulnerable code path does not require authentication, any unauthenticated attacker can craft a URL containing a script payload. When a user with an active browser session follows the link, the payload renders inline and executes with the privileges of that user on the affected site. The attack requires user interaction, which is typical for reflected XSS exploitation through phishing links, malicious ads, or embedded references. Because the vulnerability crosses trust boundaries between the attacker-controlled URL and the plugin's rendering context, exploitation can affect resources beyond the immediate component, including cookies and DOM state for the entire WordPress origin.

Root Cause

The plugin's request handling code, located in includes/bee-quick-gallery-functions.php, fails to invoke WordPress sanitization helpers such as sanitize_text_field() on inbound parameters and does not apply esc_html(), esc_attr(), or esc_url() when emitting those values back into HTML. This dual omission — missing input filtering combined with missing output encoding — is the classic pattern behind CWE-79 findings in WordPress plugins.

Attack Vector

An attacker crafts a link to a page served by the vulnerable plugin, embedding a JavaScript payload in a reflected parameter. The attacker distributes the link through phishing email, social media, or a compromised site. When a WordPress user, especially an authenticated administrator, opens the link, the script executes in the browser under the target site's origin. The script can read session cookies not flagged HttpOnly, submit authenticated requests to WordPress REST endpoints, modify DOM content to harvest credentials, or pivot to install malicious plugins if the victim holds administrative privileges. See the Wordfence Vulnerability Report and the WordPress Plugin Code Repository for technical details on the affected code paths.

Detection Methods for CVE-2025-8400

Indicators of Compromise

HTTP request logs containing URL parameters with <script>, javascript:, onerror=, onload=, or URL-encoded equivalents such as %3Cscript%3E targeting Bee Quick Gallery endpoints
Referrer headers on WordPress admin sessions originating from unexpected external domains immediately preceding suspicious administrative actions
Outbound browser requests from admin users to attacker-controlled domains shortly after clicking external links
Unexpected creation of WordPress administrator accounts or plugin installations following an XSS-suspected session

Detection Strategies

Enumerate WordPress installations to identify sites with the bee-quick-gallery plugin at version 1.0.0 or earlier
Deploy web application firewall (WAF) rules that flag reflected script content in query strings hitting plugin URLs
Correlate web server access logs with browser telemetry to identify users who followed suspicious URLs containing script markup
Review WordPress audit logs for administrative changes that occurred within minutes of anomalous inbound referrals

Monitoring Recommendations

Enable verbose HTTP access logging on the WordPress front end and forward logs to a centralized analytics platform for query-parameter inspection
Alert on any 200-response request containing angle brackets or on*= event handlers in query strings targeting the affected plugin paths
Monitor WordPress activity for unauthorized user role changes, plugin installations, or option modifications that could follow a successful XSS payload
Track browser Content Security Policy (CSP) violation reports if a CSP is deployed, as blocked inline script executions can indicate exploitation attempts

How to Mitigate CVE-2025-8400

Immediate Actions Required

Deactivate and remove the Bee Quick Gallery plugin from all WordPress installations until a patched release is available
Rotate WordPress administrator passwords and invalidate active sessions for any accounts that may have followed suspicious links
Deploy WAF rules blocking script tags and JavaScript event handlers in query strings targeting /wp-content/plugins/bee-quick-gallery/ paths
Enforce a strict Content Security Policy that disallows inline scripts to reduce the impact of reflected XSS payloads

Patch Information

At the time of the last NVD update on 2026-06-17, no fixed version is identified in the advisory. Administrators should consult the WordPress Plugin Developer Page and the Wordfence Vulnerability Report for the most current patch status. If no update is released, permanent removal of the plugin is the recommended remediation.

Workarounds

Remove the plugin entirely and replace it with a maintained gallery plugin that follows WordPress sanitization and escaping standards
Restrict access to WordPress pages that render the plugin's output using IP allowlists or authentication gates until a fix ships
Configure the WAF to strip or reject inbound requests containing HTML control characters on plugin-owned routes
Set the HttpOnly and SameSite=Strict flags on session cookies to limit theft even if injection succeeds

bash

# Example WAF rule (ModSecurity) blocking reflected XSS payloads against the affected plugin
SecRule REQUEST_URI "@contains /wp-content/plugins/bee-quick-gallery/" \
    "chain,phase:2,deny,status:403,id:1008400,\
     msg:'CVE-2025-8400 Reflected XSS attempt against Bee Quick Gallery'"
SecRule ARGS "@rx (?i)(<script|javascript:|on(error|load|click|mouseover)\s*=)" \
    "t:none,t:urlDecodeUni"