CVE-2025-53346 Overview
CVE-2025-53346 is a missing authorization vulnerability in the ThimPress Thim Core WordPress plugin. The flaw stems from incorrectly configured access control security levels [CWE-862]. Affected versions include Thim Core up to and including 2.3.3. Authenticated users with low privilege levels can exploit the issue over the network to perform actions outside their intended permission scope. The vulnerability impacts the integrity of the WordPress installation without affecting confidentiality or availability.
Critical Impact
Authenticated attackers with low privileges can bypass access controls in Thim Core 2.3.3 and earlier, modifying plugin data through unprotected endpoints exposed over the network.
Affected Products
- ThimPress Thim Core plugin for WordPress
- All versions from n/a through 2.3.3
- WordPress sites using Thim Core for theme management
Discovery Timeline
- 2026-06-02 - CVE-2025-53346 published to NVD
- 2026-06-02 - Last updated in NVD database
Technical Details for CVE-2025-53346
Vulnerability Analysis
The vulnerability is a broken access control issue classified under [CWE-862] Missing Authorization. Thim Core exposes functionality that does not verify whether the requesting user holds the capability required to perform the action. Low-privileged authenticated users can invoke restricted operations by sending crafted requests to vulnerable endpoints. The attack vector is network-based and requires no user interaction. According to Patchstack, the issue affects the plugin's permission validation logic across multiple actions. Successful exploitation modifies plugin-controlled data, breaking the integrity expectations of higher-privileged roles.
Root Cause
Thim Core registers actions or endpoints without performing capability checks such as current_user_can() before executing privileged operations. Authorization is either absent or relies on insufficient role assumptions. Any authenticated session, including subscriber-level accounts, can reach the affected handlers and trigger their logic.
Attack Vector
An attacker authenticates to the target WordPress site as any low-privileged user. The attacker then issues HTTP requests to the unprotected Thim Core endpoints. Because the plugin does not enforce role or capability checks, the request executes with the plugin's intended privileged behavior. Refer to the Patchstack Thim Core Vulnerability advisory for endpoint specifics.
Detection Methods for CVE-2025-53346
Indicators of Compromise
- Unexpected admin-ajax.php or REST API requests originating from low-privileged user sessions targeting Thim Core actions
- Modifications to Thim Core plugin settings, options, or theme configuration records without a corresponding administrative session
- New or modified WordPress options tied to Thim Core that do not align with administrator activity logs
Detection Strategies
- Audit WordPress access logs for authenticated requests to Thim Core endpoints from accounts that should not invoke plugin management functions
- Compare current Thim Core configuration against a known-good baseline to identify unauthorized changes
- Enable WordPress activity logging plugins to track role-based actions and flag privilege mismatches
Monitoring Recommendations
- Monitor HTTP POST requests to wp-admin/admin-ajax.php containing Thim Core action parameters from non-administrator sessions
- Alert on database writes to Thim Core option keys outside normal administrative workflows
- Track creation of new low-privileged accounts followed by requests to plugin-controlled endpoints
How to Mitigate CVE-2025-53346
Immediate Actions Required
- Identify all WordPress sites running Thim Core 2.3.3 or earlier and prioritize them for remediation
- Restrict new user registration and review existing low-privileged accounts for anomalous activity
- Place a web application firewall rule in front of vulnerable endpoints until the plugin is updated
Patch Information
Review the Patchstack Thim Core Vulnerability advisory for vendor-supplied fixes. Upgrade Thim Core to a version newer than 2.3.3 once the vendor publishes a patched release. Verify the installed version through the WordPress plugin management screen after update.
Workarounds
- Deactivate the Thim Core plugin until a patched version is installed if the functionality is not business-critical
- Apply WAF rules that block requests to known Thim Core actions from sessions lacking the manage_options capability
- Limit WordPress user registration and downgrade unnecessary accounts to minimize the attacker pool
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
