CVE-2025-31531 identifies a critical SQL Injection vulnerability in the History Log plugin by click5, a WordPress plugin used for logging user activities. The vulnerability arises from improper neutralization of special characters in SQL commands, allowing attackers to inject arbitrary SQL code. This can lead to unauthorized access to sensitive data stored in the database, modification or deletion of records, and potentially full compromise of the underlying database system. The affected versions include all releases up to and including 1.0.13. Since the vulnerability does not require authentication, it can be exploited remotely by unauthenticated attackers if the plugin is publicly accessible. No official patches or fixes are currently linked, and no known exploits have been observed in the wild, but the risk remains significant due to the nature of SQL Injection attacks. The plugin’s widespread use in WordPress environments means many organizations could be exposed, especially those that have not applied updates or implemented compensating controls. The lack of a CVSS score necessitates an expert severity assessment based on the vulnerability’s characteristics and potential impact.

The impact of this SQL Injection vulnerability is substantial. Attackers exploiting this flaw can gain unauthorized access to sensitive information such as user credentials, logs, and other database contents, compromising confidentiality. They may also alter or delete data, affecting data integrity and potentially disrupting business operations. In some cases, SQL Injection can be leveraged to execute administrative commands on the database server, leading to full system compromise. Organizations relying on the History Log plugin for auditing and compliance could face regulatory and reputational damage if logs are tampered with or stolen. The vulnerability’s ease of exploitation without authentication increases the risk of automated attacks and widespread exploitation once public details or exploits emerge. This threat is particularly critical for organizations with sensitive data or compliance requirements, as well as those with publicly accessible WordPress installations using the affected plugin.

1. Monitor official click5 channels and Patchstack for updates and apply patches immediately once available. 2. Until a patch is released, consider disabling or uninstalling the History Log plugin to eliminate exposure. 3. Restrict database user permissions to the minimum necessary, preventing the plugin’s database user from executing dangerous commands or accessing unrelated tables. 4. Implement a Web Application Firewall (WAF) with SQL Injection detection and prevention rules to block malicious payloads targeting this vulnerability. 5. Conduct regular security audits and vulnerability scans on WordPress installations to detect outdated plugins and potential injection points. 6. Employ input validation and sanitization at the application level where possible, although this depends on plugin code control. 7. Maintain regular backups of databases and logs to enable recovery in case of compromise. 8. Educate administrators about the risks of outdated plugins and the importance of timely updates.