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PatchSiren cyber security CVE debrief

CVE-2026-40738 Edge-Themes CVE debrief

CVE-2026-40738 is a high-severity vulnerability in the Eldon theme, versions <= 1.4.1, allowing unauthenticated PHP object injection. This vulnerability has a CVSS score of 8.1 and is considered HIGH severity. The vulnerability was published on June 17, 2026, and last modified on the same day. Users of the Eldon theme should take immediate action to mitigate this vulnerability. The vulnerability is caused by a lack of proper input validation, allowing attackers to inject malicious PHP objects. This could lead to arbitrary code execution, data breaches, or other malicious activities. Administrators should update to a patched version as soon as possible.

Vendor
Edge-Themes
Product
Eldon
CVSS
HIGH 8.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-17
Original CVE updated
2026-06-17
Advisory published
2026-06-17
Advisory updated
2026-06-17

Who should care

Administrators and users of the Eldon theme, versions <= 1.4.1, should be aware of this vulnerability and take immediate action to mitigate it. This includes updating to a patched version and ensuring that all necessary security measures are in place.

Technical summary

CVE-2026-40738 is a PHP object injection vulnerability in the Eldon theme, versions <= 1.4.1. The vulnerability allows unauthenticated attackers to inject malicious PHP objects, potentially leading to arbitrary code execution. The vulnerability has a CVSS score of 8.1 and is considered HIGH severity. The CVSS vector is CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

Defensive priority

high

Recommended defensive actions

  • Update to a patched version of the Eldon theme as soon as possible.
  • Ensure that all necessary security measures are in place, including proper input validation and sanitization.
  • Monitor for suspicious activity and implement additional security measures as needed.
  • Consider implementing a web application firewall (WAF) to detect and prevent attacks.
  • Keep software and plugins up to date with the latest security patches.
  • Implement secure coding practices to prevent similar vulnerabilities in the future.

Evidence notes

The vulnerability was reported by Patchstack and is listed in the NVD database. The CVE record and NVD detail pages provide additional information about the vulnerability.

Official resources

public