CVE-2026-19053: 
WordPress vulnerability analysis and mitigation

CVE-2026-19053 is a blind SQL injection vulnerability in the ProSolution WP Client WordPress plugin affecting all versions before 2.0.6. The flaw allows unauthenticated remote attackers to inject arbitrary SQL commands via an unsanitized jobID parameter. It was publicly disclosed on August 6, 2026, and assigned a CVSS v3.1 base score of 9.1 (Critical) by NVD, while WPScan rates it 8.6 (High) (WPScan, GitHub Advisory). The vulnerability was discovered and reported by Pablo González Pérez, Francisco José Ramírez Vicente, and Iñigo Sánchez Enciso of Telefónica (WPScan).

The root cause is improper neutralization of special elements in an SQL command (CWE-89): the plugin passes user-supplied input directly into a SQL query without adequate sanitization or escaping. The vulnerable parameter (jobID) is accessible to unauthenticated visitors, meaning no login or privilege escalation is required to reach the affected code path. The attack is delivered over the network with low complexity, making it fully automatable. The vulnerability manifests as a blind SQL injection, meaning results are not directly returned in the HTTP response but can be inferred through boolean-based or time-based techniques (WPScan, GitHub Advisory).

Successful exploitation allows an unauthenticated attacker to query, modify, or delete the contents of the WordPress database, resulting in high confidentiality and integrity impact. Sensitive data such as user credentials (including hashed passwords), personal information, and site configuration stored in the database may be extracted. While availability is not directly impacted, database manipulation could lead to site defacement, account takeover, or further compromise of the WordPress environment (WPScan, GitHub Advisory).

NVD's SSVC assessment classifies this vulnerability as automatable with a proof-of-concept (PoC) exploitation status, though the actual PoC details are withheld by WPScan until August 27, 2026, to allow time for patching (WPScan). The EPSS score is approximately 0.16–0.24%, placing it in the 16th percentile for exploitation likelihood within 30 days (GitHub Advisory). There is no current evidence of in-the-wild exploitation or threat actor attribution, and the vulnerability is not listed in the CISA KEV catalog as of the time of this report. Qualys has added detection for this vulnerability (detection ID 532057).

1. Reconnaissance: Identify WordPress sites running the ProSolution WP Client plugin (versions before 2.0.6) using tools like WPScan, Shodan, or Google dorks targeting plugin-specific file paths.
2. Locate the vulnerable endpoint: Identify the publicly accessible endpoint or form that accepts the jobID parameter without requiring authentication.
3. Craft a blind SQL injection payload: Construct boolean-based or time-based SQL injection payloads targeting the jobID parameter (e.g., jobID=1 AND SLEEP(5)-- for time-based, or jobID=1 AND 1=1-- vs. jobID=1 AND 1=2-- for boolean-based).
4. Enumerate the database: Use automated tools such as sqlmap with the identified endpoint and parameter to extract database names, table names, and column contents (e.g., sqlmap -u "https://target.com/path?jobID=1" --dbs --batch).
5. Extract sensitive data: Dump the WordPress wp_users table to retrieve usernames and hashed passwords, or access other sensitive configuration data stored in the database.
6. Post-exploitation: Crack extracted password hashes offline or use extracted credentials to authenticate to the WordPress admin panel for further site compromise (WPScan).

• Network: Unusual HTTP requests containing SQL syntax (e.g., SLEEP(), AND 1=1, UNION SELECT, --) in the jobID parameter; high volume of requests to the same endpoint with slightly varying parameter values indicative of automated enumeration.
• Logs: WordPress or web server access logs showing repeated requests to the plugin's endpoint with anomalous jobID values; time-delayed responses (e.g., 5-second gaps) consistent with time-based blind SQL injection probing.
• Database: Unexpected queries in MySQL slow query logs involving SLEEP() or complex UNION statements; unauthorized reads of the wp_users or wp_options tables.
• Process: Unusual database activity or spikes in query execution time correlating with external HTTP requests to the vulnerable endpoint.

The vendor has released version 2.0.6 of the ProSolution WP Client plugin, which addresses the SQL injection vulnerability by properly sanitizing and escaping the affected parameter. Site administrators should update to version 2.0.6 or later immediately via the WordPress plugin dashboard (WPScan). As an interim measure for sites that cannot update immediately, consider disabling or removing the plugin, or deploying Web Application Firewall (WAF) rules to block SQL injection patterns targeting the jobID parameter.