CVE-2025-2303 Overview
CVE-2025-2303 is a Remote Code Execution (RCE) vulnerability affecting the Block Logic – Full Gutenberg Block Display Control plugin for WordPress. The flaw exists in all versions up to and including 1.0.8 and resides in the block_logic_check_logic function. The function performs unsafe evaluation of user-controlled input, allowing authenticated attackers with Contributor-level access or above to execute arbitrary code on the server. The vulnerability is classified under CWE-94 (Improper Control of Generation of Code).
Critical Impact
Authenticated users with Contributor privileges can achieve full server-side code execution on affected WordPress installations, compromising site confidentiality, integrity, and availability.
Affected Products
- Block Logic – Full Gutenberg Block Display Control plugin for WordPress, versions ≤ 1.0.8
- WordPress sites permitting Contributor-level or higher accounts with the plugin installed
- Any WordPress deployment using the vulnerable block_logic_check_logic function path
Discovery Timeline
- 2025-03-22 - CVE-2025-2303 published to NVD
- 2026-04-15 - Last updated in NVD database
Technical Details for CVE-2025-2303
Vulnerability Analysis
The Block Logic plugin allows site editors to define conditional logic that controls when Gutenberg blocks render. To evaluate these conditions, the plugin's block_logic_check_logic function passes attacker-supplied logic strings into a PHP evaluation construct without sufficient sanitization or restriction. Because the input is treated as executable code, an attacker who can save a post or block with logic attributes can inject arbitrary PHP. The result is server-side code execution under the privileges of the web server process, which typically allows file system access, database queries, and lateral movement within the hosting environment.
Root Cause
The root cause is unsafe dynamic code evaluation. The plugin treats user-controlled logic expressions as trusted PHP code rather than parsing them through a restricted expression evaluator. This is a textbook [CWE-94] Code Injection pattern. The reference implementation in WordPress Block Logic Code shows the offending evaluation point at line 127 of block-logic.php.
Attack Vector
Exploitation requires an authenticated account with at least Contributor privileges. The attacker creates or edits a post containing a Gutenberg block, sets a Block Logic condition that embeds malicious PHP, and saves the content. When the conditional logic is processed, the injected code executes server-side. The attack is performed over the network through standard WordPress editor APIs and requires no additional user interaction. Because Contributor is one of WordPress's lower-trust roles, many production sites grant this level to guest authors or external contributors, broadening the exposed attack surface.
No public proof-of-concept code is referenced in the advisory. Technical details for the patched evaluation logic are available in WordPress Changeset 3430763 and the Wordfence Vulnerability Report.
Detection Methods for CVE-2025-2303
Indicators of Compromise
- Unexpected PHP files, web shells, or modified theme/plugin files in the wp-content directory following Contributor activity
- Outbound network connections from the PHP-FPM or Apache worker processes to unfamiliar hosts
- Suspicious post revisions containing PHP keywords such as system, exec, passthru, eval, or base64_decode in Block Logic attributes
Detection Strategies
- Inventory WordPress installations and flag any site running Block Logic ≤ 1.0.8
- Audit wp_posts and wp_postmeta for Block Logic condition strings containing PHP function names or backticks
- Correlate Contributor-level logins with subsequent process spawns from the web server user (for example, php invoking sh, curl, or wget)
Monitoring Recommendations
- Enable WordPress audit logging for post creation, post update, and user role assignment events
- Monitor file integrity on the wp-content/plugins, wp-content/themes, and wp-content/uploads directories
- Alert on web server processes executing shell binaries or writing to PHP files outside expected deployment workflows
How to Mitigate CVE-2025-2303
Immediate Actions Required
- Update the Block Logic plugin to a version newer than 1.0.8 as published in WordPress Changeset 3430763
- If an update is not immediately available, deactivate and remove the plugin from affected sites
- Review Contributor and higher accounts for unrecognized users and rotate credentials where compromise is suspected
- Scan affected installations for web shells, unauthorized administrative users, and modified plugin files
Patch Information
The vendor addressed the issue by replacing the unsafe evaluation in block_logic_check_logic with restricted logic parsing. Site administrators should apply the patched release referenced in WordPress Changeset 3430763. The Wordfence Vulnerability Report provides additional remediation context.
Workarounds
- Restrict Contributor and Author roles to trusted personnel only until the plugin is patched
- Place a Web Application Firewall (WAF) rule in front of wp-admin to block requests containing PHP function names within Block Logic attributes
- Disable the plugin entirely on multi-author or community sites where untrusted contributors can submit content
# Configuration example: identify vulnerable installations via WP-CLI
wp plugin list --field=name,version | grep block-logic
wp plugin update block-logic
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
