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CVE-2026-40733 Mikado-Themes CVE debrief

CVE-2026-40733 is a HIGH-severity vulnerability (CVSS Score: 8.1) affecting the ShiftUp theme, version <= 1.3. This Unauthenticated PHP Object Injection vulnerability allows attackers to inject malicious PHP objects without authentication. Successful exploitation could lead to code execution, data breaches, or system compromise. The vulnerability was published on 2026-06-17. Users of affected versions should apply patches or mitigations immediately. The vendor's response and further details are awaited. This vulnerability's impact is significant due to its unauthenticated nature and potential for code execution.

Vendor
Mikado-Themes
Product
ShiftUp
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 ShiftUp theme version <= 1.3 should be aware of this vulnerability. Given its HIGH severity and potential for unauthenticated exploitation, immediate attention is required to prevent potential attacks.

Technical summary

CVE-2026-40733 is an Unauthenticated PHP Object Injection vulnerability in the ShiftUp theme, affecting versions <= 1.3. The vulnerability is characterized by its CVSS:3.1 vector of AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H, indicating a Network attack vector with High complexity, No privileges required, and High impact on Confidentiality, Integrity, and Availability. The CWE-502 weakness is associated with this vulnerability.

Defensive priority

High

Recommended defensive actions

  • Apply patches or updates for the ShiftUp theme to version > 1.3.
  • Implement Web Application Firewalls (WAFs) to detect and block suspicious traffic.
  • Monitor systems for unusual activity indicative of exploitation.
  • Restrict access to sensitive areas of the website.
  • Regularly update and patch all software and themes.
  • Use secure protocols for data transmission.
  • Consider using security plugins or services for enhanced protection.

Evidence notes

The information provided is based on data from official sources, including the CVE.org and NVD. The CVE was published on 2026-06-17 and last modified on 2026-06-17. Details were sourced from Patchstack and NVD.

Official resources

public