# CVE-2026-40733: Mikado-Themes ShiftUp PHP Object Injection

Source: https://junglewise.ai/threats/cve-2026-40733-mikado-themes-shiftup-php-object-injection  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-17. Updated: 2026-06-20  
License: CC BY 4.0 with a link back

CVE-2026-40733 · Severity: high · CVSS 8.1 · Published 2026-06-17

The ShiftUp theme for WordPress is vulnerable to a security flaw that allows unauthorized individuals to inject malicious code into a website. ShiftUp is a visual theme used to design and display WordPress sites. If exploited, an attacker could potentially take full control of the website, steal sensitive customer data, or cause the site to become unavailable, leading to significant operational and reputational damage.

Vendors: [Mikado-Themes](https://junglewise.ai/threats/vendors/mikado-themes).

## Quick answers

**Is CVE-2026-40733 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-40733 being exploited in the wild.

**How severe is CVE-2026-40733?** High severity, with a CVSS score of 8.1, published 17 June 2026.

**Which products and versions are affected?** Mikado-Themes ShiftUp <= 1.3.

**Is there a fix for CVE-2026-40733?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-40733 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-40733?** Check whether you run Mikado-Themes ShiftUp at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The ShiftUp theme for WordPress is vulnerable to PHP Object Injection in versions up to and including 1.3. This vulnerability occurs due to the deserialization of untrusted data (CWE-502) without proper validation. An unauthenticated remote attacker can exploit this by sending specially crafted input to the application. If a suitable Property-Oriented Programming (POP) chain is present in the environment, the attacker can achieve remote code execution, perform SQL injection, or conduct path traversal. The vulnerability is addressed in version 1.4.

## Affected products

- Mikado-Themes ShiftUp <= 1.3

## Timeline

- 2026-02-11: other: Reported by Denver Jackson
- 2026-04-16: disclosed: Vulnerability details published by Patchstack
- 2026-06-17: advisory: CVE published to NVD

## References

- [https://wordpress.org/themes](https://wordpress.org/themes)
- [https://patchstack.com/database/wordpress/theme/shiftup/vulnerability/wordpress-shiftup-theme-1-3-php-object-injection-vulnerability?_s_id=cve](https://patchstack.com/database/wordpress/theme/shiftup/vulnerability/wordpress-shiftup-theme-1-3-php-object-injection-vulnerability?_s_id=cve)