CVE-2025-58791 Overview
CVE-2025-58791 is a stored Cross-Site Scripting (XSS) vulnerability in the Arjan Olsder SEO Auto Linker WordPress plugin (wpa-seo-auto-linker). The flaw stems from improper neutralization of user-supplied input during web page generation [CWE-79]. All plugin versions up to and including 1.5.3 are affected. An authenticated attacker with high privileges can inject persistent script payloads that execute in the browsers of users viewing affected pages. The scope change indicates the injected script can affect components beyond the vulnerable plugin itself.
Critical Impact
Attackers with high-privilege access can store malicious JavaScript that executes in visitors' browsers, enabling session theft, content manipulation, or redirection to attacker-controlled infrastructure.
Affected Products
- Arjan Olsder SEO Auto Linker (wpa-seo-auto-linker) plugin for WordPress
- All versions from n/a through 1.5.3
- WordPress sites with the SEO Auto Linker plugin installed and active
Discovery Timeline
- 2025-09-05 - CVE-2025-58791 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-58791
Vulnerability Analysis
The vulnerability is a stored XSS flaw in the SEO Auto Linker plugin's input handling logic. The plugin fails to properly sanitize or encode user-supplied input before rendering it in generated web pages. When an attacker submits crafted input containing HTML or JavaScript, the payload is stored in the WordPress database and later returned to any user who loads the affected page.
Exploitation requires an authenticated account with high privileges and some level of user interaction to trigger the payload. Because the vulnerability results in a scope change, the injected script can affect resources outside the plugin's own security context, including other WordPress components rendered on the same page.
Root Cause
The root cause is missing or insufficient output encoding when the plugin renders stored data back into the page. Input received through plugin configuration or content fields is written to the database without adequate sanitization. On subsequent rendering, WordPress escaping functions such as esc_html(), esc_attr(), or wp_kses() are not applied consistently, allowing script tags and event handlers to execute in the browser context.
Attack Vector
Exploitation is network-based and requires the attacker to hold an authenticated account with elevated privileges on the target WordPress site. The attacker submits a payload through the plugin's input fields. The stored payload activates when an administrator, editor, or site visitor loads a page that renders the injected content. Successful execution grants the attacker the ability to run arbitrary JavaScript under the origin of the vulnerable site.
See the Patchstack WordPress Vulnerability Analysis for additional technical details.
Detection Methods for CVE-2025-58791
Indicators of Compromise
- Presence of <script> tags, onerror, onload, or javascript: URIs in SEO Auto Linker plugin configuration entries stored in the wp_options or plugin-specific database tables.
- Unexpected outbound HTTP requests from browser sessions of authenticated WordPress users to unfamiliar domains.
- Modifications to plugin settings performed by accounts that do not typically manage SEO configuration.
Detection Strategies
- Audit database records associated with the wpa-seo-auto-linker plugin for HTML or JavaScript syntax in fields expected to contain plain text.
- Deploy Content Security Policy (CSP) reporting to identify inline script execution originating from plugin-rendered pages.
- Review WordPress access logs for POST requests to plugin administrative endpoints from unexpected source IP addresses.
Monitoring Recommendations
- Monitor authentication events for high-privilege WordPress accounts and alert on logins from new geographies or user agents.
- Enable file integrity monitoring on the wp-content/plugins/wpa-seo-auto-linker/ directory to detect unauthorized changes.
- Correlate administrative activity in WordPress with browser telemetry to identify script execution tied to plugin-rendered pages.
How to Mitigate CVE-2025-58791
Immediate Actions Required
- Deactivate the SEO Auto Linker plugin on affected WordPress sites until a patched version is confirmed available and installed.
- Review all plugin configuration entries and remove any content containing HTML tags, JavaScript, or suspicious URIs.
- Rotate credentials for all WordPress administrator and editor accounts, and enforce multi-factor authentication.
Patch Information
At the time of publication, no fixed version beyond 1.5.3 is documented in the referenced advisory. Administrators should monitor the Patchstack advisory and the plugin's WordPress.org page for an official update. If no patch is released, consider replacing the plugin with a maintained alternative.
Workarounds
- Restrict high-privilege WordPress roles to the minimum number of trusted administrators required to operate the site.
- Deploy a web application firewall (WAF) with rules that block XSS payloads targeting WordPress plugin administrative endpoints.
- Apply a strict Content Security Policy that disallows inline scripts and restricts script sources to a vetted allowlist.
- Remove the plugin entirely if it is not essential to site operations.
# Example: disable the plugin via WP-CLI
wp plugin deactivate wpa-seo-auto-linker
wp plugin delete wpa-seo-auto-linker
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
