CVE-2025-15377 Overview
CVE-2025-15377 is a Cross-Site Request Forgery (CSRF) vulnerability affecting the Sosh Share Buttons plugin for WordPress in all versions up to and including 1.1.0. The flaw stems from missing nonce validation in the admin_page_content function. Unauthenticated attackers can update the plugin's settings by tricking a site administrator into clicking a crafted link or visiting an attacker-controlled page. The vulnerability is categorized under [CWE-352] and requires user interaction to succeed. While the impact is limited to integrity of plugin settings, exploitation does not require any authentication on the target site.
Critical Impact
Unauthenticated attackers can modify Sosh Share Buttons plugin settings on vulnerable WordPress sites by tricking an administrator into clicking a forged request.
Affected Products
- Sosh Share Buttons plugin for WordPress, all versions up to and including 1.1.0
- WordPress sites with the plugin installed and active
- WordPress administrator accounts with active sessions on affected sites
Discovery Timeline
- 2026-01-14 - CVE-2025-15377 published to NVD
- 2026-04-15 - Last updated in NVD database
Technical Details for CVE-2025-15377
Vulnerability Analysis
The vulnerability resides in the admin_page_content function of the Sosh Share Buttons plugin, defined in sosh.class.php. The function processes administrative requests that update plugin settings but does not implement WordPress nonce validation. Nonces are tokens generated per session and per action that allow WordPress to verify the origin and intent of state-changing requests.
Without nonce validation, the server cannot distinguish between a request issued from the legitimate admin interface and a request triggered by an external page. An attacker hosting a malicious page can construct an HTML form or JavaScript request that submits to the plugin's settings endpoint. When an authenticated administrator visits the attacker-controlled page, the browser automatically attaches the administrator's session cookies to the cross-origin request, and the plugin processes the changes.
Root Cause
The root cause is the absence of a check_admin_referer() or wp_verify_nonce() call inside admin_page_content before plugin settings are written. WordPress provides these primitives specifically to defeat CSRF, and their omission leaves any state-changing handler exposed to forged requests.
Attack Vector
Exploitation is network-based and requires user interaction. An attacker crafts a web page or email link containing a hidden form or fetch request targeting the vulnerable settings handler on the victim WordPress site. The attacker then social-engineers an administrator into visiting the page or clicking the link. Because the request rides on the administrator's existing authenticated session, the plugin accepts and applies the malicious settings update. See the WordPress Plugin Source Code and the Wordfence Vulnerability Analysis for additional technical detail.
No public proof-of-concept or in-the-wild exploitation has been reported. The vulnerability manifests in the absence of nonce checks rather than in user-supplied input handling, so no representative code example is reproduced here.
Detection Methods for CVE-2025-15377
Indicators of Compromise
- Unexpected modifications to Sosh Share Buttons plugin settings without corresponding administrator activity in audit logs
- HTTP POST requests to the plugin's admin endpoints with Referer headers from external domains
- Administrator browser history showing visits to untrusted sites shortly before unauthorized configuration changes
Detection Strategies
- Review WordPress administrator activity logs for plugin setting changes that lack a matching admin session origin
- Inspect web server access logs for requests to plugin admin URLs with cross-origin Referer values or missing _wpnonce parameters
- Monitor file integrity on wp-options database entries associated with the Sosh Share Buttons plugin
Monitoring Recommendations
- Enable a WordPress audit logging plugin to record administrator-initiated setting changes with full request context
- Forward web server and WordPress logs to a centralized SIEM for correlation against administrator login sessions
- Alert on configuration drift in plugin options stored in the wp_options table
How to Mitigate CVE-2025-15377
Immediate Actions Required
- Deactivate the Sosh Share Buttons plugin until a patched version is released and verified
- Instruct WordPress administrators to log out of admin sessions before browsing untrusted sites
- Review plugin settings for unauthorized changes and restore expected values
Patch Information
At the time of the latest NVD update on 2026-04-15, all versions through 1.1.0 remain vulnerable. Administrators should monitor the WordPress plugin repository for an updated release that adds nonce validation to the admin_page_content function. Apply any vendor-supplied update immediately upon release.
Workarounds
- Restrict access to /wp-admin/ via IP allow-listing at the web server or WAF tier
- Deploy a Web Application Firewall rule that requires a valid _wpnonce parameter on POST requests to plugin admin endpoints
- Use a browser session isolation policy so administrators perform WordPress administration in a dedicated browser profile
- Remove the plugin entirely if share-button functionality is not essential
# Example: disable the plugin via WP-CLI until a patch is available
wp plugin deactivate sosh-share-buttons
wp plugin delete sosh-share-buttons
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
