CVE-2026-57648 Nelio Software CVE debrief

Who should care

Website administrators and security teams using the Nelio Content plugin versions <= 4.3.4 should be aware of this vulnerability and take necessary actions to mitigate the risk. This vulnerability could potentially allow attackers to access sensitive areas of the website without proper authorization. It is recommended to update the plugin to a version that fixes this issue.

Technical summary

CVE-2026-57648 is a broken access control vulnerability in the Nelio Content plugin. The vulnerability has a CVSS score of 4.3 and a severity level of medium. The CVSS vector for this vulnerability is CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N. This means that the vulnerability can be exploited remotely, requires low privileges, and has a low impact on confidentiality, but a low impact on integrity and availability. The vulnerability is categorized under CWE-862.

Defensive priority

Medium priority should be given to patching this vulnerability, as it could potentially allow unauthorized access to sensitive areas of the website. It is recommended to update the Nelio Content plugin to a version that fixes this issue.

Recommended defensive actions

• Update the Nelio Content plugin to a version that fixes this issue.
• Review website logs for any suspicious activity related to the Nelio Content plugin.
• Implement additional security measures to restrict access to sensitive areas of the website.

Evidence notes

The source of this information is the National Vulnerability Database (NVD) and Patchstack. The vulnerability was published on June 26, 2026, and last modified on June 29, 2026. The CVSS score for this vulnerability is 4.3, indicating a medium severity level.

Official resources