CVE-2026-57676 Matteo Manna CVE debrief

Who should care

Administrators and users of the Simple User Avatar plugin for WordPress should be aware of this vulnerability, especially if they are using versions prior to an updated version beyond 4.9. Given the medium severity and potential for exploitation, defenders should prioritize assessing their exposure and applying necessary patches or mitigations.

Technical summary

The CVE-2026-57676 vulnerability is an instance of Authorization Bypass Through User-Controlled Key in the Simple User Avatar plugin. This issue arises from the plugin's insecure handling of user-controlled keys, potentially allowing unauthorized access to sensitive information or functionality. The Common Weakness Enumeration (CWE) identifier for this vulnerability is CWE-639. The vulnerability's CVSS vector is CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N, indicating that the attack vector is network-based, authentication is required at the level of low privilege, and the impact is limited to confidentiality.

Defensive priority

Defenders should prioritize patching or mitigating this vulnerability due to its medium severity and the potential for exploitation. Given that the vulnerability affects versions from n/a through 4.9 of the Simple User Avatar plugin, defenders should ensure they are using an updated version beyond 4.9.

Recommended defensive actions

• Assess exposure to CVE-2026-57676 by identifying all instances of the Simple User Avatar plugin version 4.9 or earlier in the environment.
• Prioritize patching or updating the Simple User Avatar plugin to a version beyond 4.9.
• Implement additional monitoring for potential exploitation attempts targeting this vulnerability.
• Review and adjust access controls and security configurations for the Simple User Avatar plugin to ensure they are properly set up.
• Consider applying compensating controls if immediate patching is not feasible.

Evidence notes

The CVE record for CVE-2026-57676 was obtained from the official CVE.org database. Additional details were sourced from the National Vulnerability Database (NVD) and a mitigation reference from Patchstack. The information indicates a medium severity vulnerability in the Simple User Avatar plugin, with a CVSS score of 4.3.

Official resources