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CVE-2026-19049 – Unauthenticated SQL Injection – ProSolution WP Client WordPress Plugin (before 2.0.

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Summary

CVE-2026-19049 is an unauthenticated SQL Injection vulnerability (CWE-89) in the ProSolution WP Client WordPress plugin, affecting all versions before 2.0.9. The plugin fails to sanitize a cookie value (identified as the "removesite" cookie) before using it in a SQL query, and processes this cookie on every request without any authentication or capability checks. The flaw carries a CVSS v3.1 base score of 8.6 (High) and allows unauthenticated attackers to read arbitrary data from the WordPress database and delete plugin-stored records.

Technical details

  • Root cause: The plugin takes the value of a cookie (referred to as "removesite") and inserts it directly into a SQL query without sanitization or use of parameterized queries/prepared statements.
  • Trigger conditions: The vulnerable code path executes on every request handled by the plugin — there is no authentication or capability check gating access to the vulnerable functionality, so simply sending a crafted cookie value is sufficient to trigger the flaw.
  • Attack vector: Network-based (AV:N), exploitable remotely over HTTP/HTTPS by sending a specially crafted cookie value to any page where the plugin processes requests. No user interaction and no privileges are required.
  • Impact: Successful exploitation allows an unauthenticated attacker to perform SQL injection, enabling extraction of arbitrary data from the site’s database (high confidentiality impact, scope changed) and deletion of records stored by the plugin. Integrity and availability of unrelated data are not directly scored as impacted, but the ability to delete plugin records and exfiltrate database content is a significant risk to affected WordPress sites.

Affected software

  • ProSolution WP Client WordPress plugin — all versions prior to 2.0.9

Severity

  • CVSS v3.1 Base Score: 8.6 (High)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Mitigation and recommended actions

  • Immediate: Update the ProSolution WP Client plugin to version 2.0.9 or later, where the cookie value is properly sanitized before use in SQL queries.
  • If immediate patching is not possible:
    • Restrict or strip the "removesite" cookie at the web application firewall (WAF) or reverse proxy layer for untrusted/unauthenticated traffic.
    • Deploy WAF rules to detect and block SQL injection payloads in cookie headers.
    • Monitor database and plugin activity logs for anomalous read/delete operations tied to this plugin.
    • Consider temporarily deactivating the plugin on internet-facing WordPress instances until the update can be applied.

References

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