CVE-2025-27006 Overview
CVE-2025-27006 is a stored cross-site scripting (XSS) vulnerability in the themeplugs Authorsy WordPress plugin. The flaw affects all versions of Authorsy up to and including 1.0.5. The plugin fails to properly neutralize user-controlled input during web page generation, allowing authenticated attackers with low privileges to inject persistent JavaScript payloads. When other users load the affected pages, the payload executes in their browser context. The vulnerability is classified under [CWE-79]: Improper Neutralization of Input During Web Page Generation.
Critical Impact
Authenticated attackers can inject persistent JavaScript that executes in the browsers of other site users, enabling session hijacking, credential theft, and defacement across the WordPress site.
Affected Products
- themeplugs Authorsy WordPress plugin, versions up to and including 1.0.5
- WordPress sites with the Authorsy plugin installed and activated
- Any user visiting pages rendering unsanitized author-related content
Discovery Timeline
- 2025-09-26 - CVE-2025-27006 published to the National Vulnerability Database (NVD)
- 2026-06-17 - Entry last modified in the NVD database
Technical Details for CVE-2025-27006
Vulnerability Analysis
The Authorsy plugin extends WordPress with multi-author attribution features. The vulnerability stems from improper handling of user-supplied input rendered back into HTML output. An authenticated attacker submits crafted input through plugin-managed fields. The plugin stores the payload and later renders it without adequate output encoding or contextual escaping.
Exploitation requires low privileges and user interaction. A victim browsing an affected page triggers execution of the stored script. Because the injected code runs in the site's origin, it can perform actions as the viewing user, including administrators. The scope change indicates that a successful attack can affect resources beyond the vulnerable component.
Root Cause
The root cause is missing or insufficient sanitization on input and missing output encoding during page rendering. WordPress provides functions such as wp_kses, esc_html, esc_attr, and sanitize_text_field for context-aware escaping. The plugin does not apply these consistently to author metadata fields before storing values or emitting them into the HTML response.
Attack Vector
The attack vector is network-accessible and requires authentication with contributor-level or similar privileges available in the plugin's workflow. The attacker submits a payload containing HTML or JavaScript through a supported input field. The malicious content persists in the database. When a victim, including an administrator, views a page that renders the field, the browser executes the script. Consequences include session token theft, forced administrative actions through the WordPress REST API, and phishing overlays.
See the Patchstack XSS Vulnerability Report for advisory details.
Detection Methods for CVE-2025-27006
Indicators of Compromise
- Unexpected <script>, onerror=, onload=, or javascript: strings within wp_postmeta or wp_usermeta rows associated with the Authorsy plugin.
- Outbound requests from administrator browsers to unfamiliar domains shortly after loading author pages.
- New or modified WordPress administrator accounts, plugins, or themes created without change-management records.
- Web server logs showing repeated POST requests to Authorsy endpoints from low-privilege user sessions.
Detection Strategies
- Scan the WordPress database for HTML tags and event handlers stored in Authorsy-controlled metadata fields.
- Deploy a web application firewall rule that flags requests containing script tags or JavaScript event handlers targeting plugin endpoints.
- Enable a strict Content Security Policy (CSP) in report-only mode to surface inline script violations in production pages.
Monitoring Recommendations
- Audit contributor and author account activity for anomalous content submissions or profile changes.
- Alert on modifications to wp_options, wp_users, or plugin metadata tables outside approved maintenance windows.
- Correlate WordPress access logs with endpoint telemetry to identify browser sessions loading suspicious inline scripts.
How to Mitigate CVE-2025-27006
Immediate Actions Required
- Update the Authorsy plugin to a version above 1.0.5 once the vendor publishes a patched release.
- Audit existing Authorsy content and remove any stored HTML or JavaScript payloads from author metadata fields.
- Rotate credentials and session tokens for administrator and editor accounts that may have viewed compromised pages.
- Review WordPress role assignments and remove unnecessary contributor or author permissions.
Patch Information
At the time of publication, the vendor advisory tracked by Patchstack indicates the issue affects all Authorsy versions through 1.0.5. Administrators should monitor the Patchstack advisory and the plugin's WordPress.org page for a fixed release, then apply it through the WordPress plugin updater.
Workarounds
- Deactivate and remove the Authorsy plugin until a patched version is available.
- Restrict contributor and author accounts to trusted users and enforce multi-factor authentication.
- Deploy a web application firewall ruleset that blocks XSS payloads targeting WordPress plugin endpoints.
- Enforce a strict Content Security Policy that disallows inline scripts and untrusted script sources.
# Example: enforce a restrictive Content Security Policy header in Apache
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'self'"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
