CVE-2025-30843 Overview
CVE-2025-30843 is a SQL Injection vulnerability affecting the Setriosoft bizcalendar-web WordPress plugin. The flaw stems from improper neutralization of special elements used in an SQL command [CWE-89]. All plugin versions from initial release through 1.1.0.34 are affected. An authenticated attacker with high privileges can inject arbitrary SQL statements into database queries over the network. Successful exploitation impacts confidentiality of stored data and can affect availability of the WordPress backend.
Critical Impact
Authenticated attackers can extract sensitive database contents from WordPress sites running vulnerable versions of the BizCalendar-Web plugin, with a scope change permitting impact beyond the plugin's own security boundary.
Affected Products
- Setriosoft BizCalendar-Web plugin for WordPress
- All versions from initial release through 1.1.0.34
- WordPress installations using the vulnerable plugin
Discovery Timeline
- 2025-03-27 - CVE-2025-30843 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-30843
Vulnerability Analysis
The vulnerability resides in the BizCalendar-Web plugin's handling of user-supplied input that is passed into SQL queries. The plugin fails to properly sanitize or parameterize input before concatenating it into SQL statements executed against the WordPress database. An attacker authenticated with high privileges can craft input that alters query semantics. The scope change indicated in the CVSS vector means exploitation can impact resources beyond the plugin itself, including data owned by other WordPress components sharing the database.
The primary impact is on data confidentiality. Attackers can enumerate WordPress tables, extract user credentials, session tokens, and post metadata. Integrity is not directly affected according to the CVSS vector, but availability may be degraded through resource-intensive injected queries.
Root Cause
The root cause is missing input validation and lack of prepared statements in database query construction [CWE-89]. User-controlled parameters flow directly into SQL query strings without escaping through WordPress's $wpdb->prepare() API. This allows injected SQL syntax to be interpreted by the MySQL/MariaDB backend.
Attack Vector
Exploitation requires an authenticated session with high privileges on the target WordPress instance. The attacker submits crafted HTTP requests to plugin endpoints that accept parameters used in database queries. No user interaction is required beyond the attacker's own session. The vulnerability manifests in database query construction functions within the plugin. See the Patchstack Vulnerability Report for technical details.
Detection Methods for CVE-2025-30843
Indicators of Compromise
- Unusual SQL syntax fragments such as UNION SELECT, SLEEP(, or INFORMATION_SCHEMA appearing in HTTP request parameters targeting bizcalendar-web plugin endpoints
- Unexpected outbound data transfers from the WordPress host following administrative sessions
- Anomalous database query patterns or long-running queries originating from the WordPress PHP process
Detection Strategies
- Inspect WordPress access logs for requests to /wp-admin/admin-ajax.php and plugin routes containing SQL metacharacters like single quotes, comments (--, #), or SQL keywords
- Deploy a web application firewall with signatures for SQL injection patterns targeting WordPress plugin endpoints
- Enable MySQL general query logging temporarily to identify malformed or suspicious queries referencing WordPress tables
Monitoring Recommendations
- Alert on privileged WordPress account activity outside normal business hours, since exploitation requires high privileges
- Monitor for creation of new administrative users or unexpected changes to the wp_users and wp_usermeta tables
- Track plugin version inventory across WordPress deployments to identify hosts running bizcalendar-web at or below version 1.1.0.34
How to Mitigate CVE-2025-30843
Immediate Actions Required
- Identify all WordPress instances running the BizCalendar-Web plugin and confirm installed version
- Update the plugin to a version later than 1.1.0.34 as soon as a fixed release is available from Setriosoft
- Rotate credentials for any WordPress administrator accounts that may have been used on compromised instances
- Review WordPress audit logs for evidence of exploitation prior to patching
Patch Information
At the time of publication, users should consult the Patchstack Vulnerability Report for the latest patch status. Any version after 1.1.0.34 released by the vendor to address this issue should be applied.
Workarounds
- Deactivate and remove the BizCalendar-Web plugin until a fixed version is available
- Restrict administrative access to the WordPress dashboard using IP allowlisting or VPN-only access
- Deploy WAF rules that block SQL injection payloads targeting the plugin's endpoints
- Enforce least privilege by auditing which accounts hold administrative WordPress roles
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
