CVE-2026-25010: Share This Image Auth Bypass Flaw

CVE-2026-25010 Overview

A Missing Authorization vulnerability has been identified in the ILLID Share This Image WordPress plugin (share-this-image). This vulnerability allows attackers to exploit incorrectly configured access control security levels, potentially enabling unauthorized actions within the plugin's functionality.

The vulnerability stems from inadequate authorization checks (CWE-862), where the plugin fails to properly verify user permissions before allowing certain operations to be performed.

Critical Impact

Unauthenticated attackers can bypass access control mechanisms to perform unauthorized actions, potentially modifying plugin settings or content without proper authorization.

Affected Products

• ILLID Share This Image WordPress Plugin version 2.09 and earlier
• All installations of the share-this-image plugin through version 2.09

Discovery Timeline

• February 3, 2026 - CVE-2026-25010 published to NVD
• February 3, 2026 - Last updated in NVD database

Technical Details for CVE-2026-25010

Vulnerability Analysis

This vulnerability is classified as a Broken Access Control issue, specifically involving missing authorization checks within the Share This Image WordPress plugin. The plugin fails to implement proper permission verification before processing certain requests, allowing unauthenticated users to access functionality that should require elevated privileges.

The network-accessible nature of this vulnerability means that attackers can exploit it remotely without any prior authentication or user interaction. While the integrity impact is limited, the complete absence of authorization checks makes this vulnerability easily exploitable by any remote attacker.

Root Cause

The root cause of CVE-2026-25010 is the absence of capability checks or nonce verification in one or more of the plugin's AJAX handlers or administrative functions. WordPress plugins are expected to verify user capabilities using functions like current_user_can() before processing sensitive operations. The Share This Image plugin fails to implement these checks, resulting in broken access control.

This type of vulnerability (CWE-862: Missing Authorization) occurs when software does not perform an authorization check when an actor attempts to access a resource or perform an action that requires proper credentials.

Attack Vector

The attack vector for this vulnerability is network-based, requiring no privileges or user interaction to exploit. An attacker can directly send crafted HTTP requests to the vulnerable WordPress installation targeting the Share This Image plugin's endpoints. Since no authentication is required, any remote attacker can potentially exploit this vulnerability to perform unauthorized modifications.

The exploitation scenario involves:

1. Identifying a WordPress site with the vulnerable Share This Image plugin installed
2. Sending crafted requests to the plugin's vulnerable endpoints
3. Bypassing access controls to perform unauthorized actions

For detailed technical information about this vulnerability, refer to the Patchstack Vulnerability Report.

Detection Methods for CVE-2026-25010

Indicators of Compromise

• Unexpected modifications to Share This Image plugin settings or configurations
• Unusual HTTP POST requests to WordPress AJAX endpoints related to the share-this-image plugin
• Server access logs showing unauthenticated requests to plugin-specific endpoints
• Changes to plugin behavior or functionality without administrator action

Detection Strategies

• Monitor WordPress access logs for suspicious requests targeting /wp-admin/admin-ajax.php with actions related to Share This Image plugin
• Implement Web Application Firewall (WAF) rules to detect unauthorized access attempts to WordPress plugin endpoints
• Deploy SentinelOne Singularity Platform to detect and alert on suspicious web application behavior
• Regularly audit WordPress plugin configurations for unexpected changes

Monitoring Recommendations

• Enable detailed logging for WordPress AJAX requests and plugin activities
• Configure alerts for failed authorization attempts and unusual request patterns
• Monitor for requests from unusual geographic locations or IP addresses targeting plugin endpoints
• Implement integrity monitoring for plugin files and database settings

How to Mitigate CVE-2026-25010

Immediate Actions Required

• Update the Share This Image plugin to a version newer than 2.09 once a patched version is available
• If no patch is available, consider temporarily deactivating the Share This Image plugin until a fix is released
• Implement additional access controls at the web server or WAF level to restrict access to plugin endpoints
• Review WordPress user accounts and permissions for any unauthorized changes
• Audit recent activity logs for signs of exploitation

Patch Information

Site administrators should check for updates to the Share This Image plugin through the WordPress dashboard or via the Patchstack vulnerability database for the latest remediation guidance. Ensure automatic updates are enabled for WordPress plugins where possible to receive security patches promptly.

Workarounds

• Temporarily disable the Share This Image plugin if it is not critical to site functionality
• Implement IP-based access restrictions to limit who can access WordPress administrative endpoints
• Add WAF rules to block suspicious requests targeting the share-this-image plugin
• Use WordPress security plugins to add additional authorization layers

# Disable the Share This Image plugin via WP-CLI
wp plugin deactivate share-this-image

# Verify plugin status
wp plugin status share-this-image

# Add .htaccess rule to restrict plugin access (Apache)
# Add to .htaccess in WordPress root directory:
# <FilesMatch "share-this-image">
#   Require ip 192.168.1.0/24
# </FilesMatch>