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CVE-2026-73355 – Unauthenticated SQL Injection – Affiliates Manager WordPress Plugin (≤ 2.9.53)

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Summary

CVE-2026-73355 is a critical, unauthenticated SQL Injection vulnerability affecting the Affiliates Manager WordPress plugin (developed by wp.insider), impacting all versions up to and including 2.9.53. The flaw allows unauthenticated remote attackers to inject and execute arbitrary SQL statements against the site’s database, potentially exposing sensitive data. It carries a CVSS v3.1 base score of 9.3 (Critical), reflecting its network-based, low-complexity, no-authentication attack path.

Technical details

  • Root cause: Improper neutralization of special elements used in an SQL command (CWE-89) — user-supplied input reaching the plugin’s database queries is not properly sanitized or parameterized.
  • Trigger conditions: No authentication or user interaction is required; an attacker can send crafted requests to a vulnerable Affiliates Manager endpoint to trigger the injection.
  • Attack vector: Network — exploitable remotely over HTTP(S) against any internet-exposed WordPress site running the vulnerable plugin.
  • Impact: The CVSS vector indicates a Scope Change (S:C), High confidentiality impact, and Low availability impact, with no integrity impact — consistent with blind/data-exfiltration-style SQL injection (CAPEC-7: Blind SQL Injection) rather than direct data tampering. Successful exploitation could allow extraction of sensitive database contents (e.g., user credentials, affiliate data) and partial disruption of site availability.

Affected software

  • Affiliates Manager WordPress plugin (wp.insider / affiliates-manager) — all versions up to and including 2.9.53
  • Fixed in version 2.9.54

Severity

  • CVSS v3.1 Base Score: 9.3 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:L

Mitigation and recommended actions

  • Immediate: Update the Affiliates Manager plugin to version 2.9.54 or later, where the SQL injection has been fixed.
  • If immediate patching is not possible:
    • Restrict or disable public access to the affected plugin’s endpoints via a web application firewall (WAF) until the patch can be applied.
    • Monitor web server and database logs for anomalous or malformed query parameters indicative of SQL injection attempts.
    • As a precaution, consider temporarily deactivating the plugin on internet-facing WordPress instances if patching cannot be performed promptly, given the unauthenticated, network-exploitable nature of this vulnerability.

References

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