CVE-2026-24572: 
WordPress vulnerability analysis and mitigation

CVE-2026-24572 is a Blind SQL Injection vulnerability in the Nelio Content WordPress plugin by Nelio Software, classified under CWE-89. It affects all versions of the plugin through 4.2.0, with the patched version being 4.2.1. The vulnerability was reported on December 22, 2025, by researcher Doan Dinh Van and publicly disclosed on January 21–23, 2026. It carries a CVSS v3.1 base score of 8.5 (High), assigned by Patchstack (Patchstack).

The vulnerability is rooted in improper neutralization of special elements used in SQL commands (CWE-89), allowing an attacker to inject malicious SQL syntax into database queries executed by the Nelio Content plugin. The attack is network-based, requires only low privileges (Contributor-level WordPress access), and does not require user interaction. The exploitation technique is specifically Blind SQL Injection, meaning the attacker infers database contents through boolean-based or time-based response differences rather than direct output. The scope is changed, indicating the vulnerability can impact resources beyond the plugin's own security context (Patchstack, Red Hat CVE).

Successful exploitation allows a low-privileged attacker (e.g., a WordPress Contributor) to extract sensitive data from the WordPress database, including user credentials, private content, and configuration data, resulting in high confidentiality impact. Integrity impact is rated none, while availability impact is low, suggesting potential for minor disruption. Because the scope is changed, the vulnerability may affect database resources beyond the plugin itself, increasing the risk of broader data exposure across the WordPress installation (Patchstack).

There is no known public proof-of-concept exploit and no evidence of active in-the-wild exploitation at this time. The EPSS score is approximately 0.011% (0.000110), indicating a very low probability of exploitation in the near term. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. Patchstack notes the priority as "Low" and considers it unlikely to be exploited, though it warns that SQL injection vulnerabilities of this class are sometimes used in mass-exploit campaigns targeting WordPress plugins (Patchstack, Red Hat CVE).

1. Reconnaissance: Identify WordPress sites running the Nelio Content plugin version 4.2.0 or earlier using tools like WPScan, Shodan, or by inspecting plugin metadata in publicly accessible WordPress installations.
2. Obtain low-privileged access: Register or obtain Contributor-level credentials on the target WordPress site, as the vulnerability requires at minimum this privilege level.
3. Identify the vulnerable parameter: Interact with the Nelio Content plugin's functionality (e.g., content scheduling or editorial calendar features) and intercept HTTP requests using a proxy tool such as Burp Suite to identify parameters passed to backend SQL queries.
4. Inject blind SQL payload: Craft boolean-based or time-based blind SQL injection payloads (e.g., using AND SLEEP(5)-- or AND 1=1-- vs. AND 1=2--) and inject them into the vulnerable parameter to infer database structure and contents based on response timing or behavior differences.
5. Extract data: Use automated tools such as sqlmap with the identified vulnerable endpoint and session cookies to systematically enumerate database tables, extract WordPress user hashes, and retrieve sensitive configuration data (Patchstack).

• Network: Unusual or repeated HTTP requests to Nelio Content plugin endpoints containing SQL metacharacters (e.g., single quotes, SLEEP(), AND 1=1, UNION SELECT) in query parameters; anomalous response time variations suggesting time-based blind SQL injection probing.
• Logs: WordPress access logs showing repeated requests from a single IP to plugin-specific endpoints with encoded or obfuscated SQL syntax; database slow query logs recording unexpectedly long-running queries originating from the WordPress application user.
• Process/Application: Unexpected database queries involving SLEEP(), BENCHMARK(), or boolean logic patterns in MySQL general query logs; database activity from the WordPress DB user that enumerates table schemas or extracts user credential data.

The vendor has released a patched version: Nelio Content 4.2.1, which resolves the SQL injection vulnerability. All users running version 4.2.0 or earlier should update immediately via the WordPress plugin dashboard. As a temporary workaround if immediate patching is not possible, consider disabling the Nelio Content plugin, restricting access to the WordPress admin and contributor roles, and implementing a web application firewall (WAF) rule to block SQL injection patterns targeting the plugin's endpoints. Patchstack users can enable auto-update for vulnerable plugins to automate remediation (Patchstack).

The vulnerability received coverage from Wordfence in their weekly WordPress vulnerability report for January 19–25, 2026, and was noted by The Hacker Wire on social media platforms including Bluesky and Mastodon. Community reaction has been relatively muted given the low exploitation probability and the availability of a patch. No significant vendor statements beyond the Patchstack advisory have been issued (Wordfence Blog, The Hacker Wire).