Executive brief
The Reisen theme for WordPress is vulnerable to a critical security flaw that allows attackers to inject malicious code without needing a password. This theme is used to manage the visual layout and functionality of WordPress websites. If exploited, an attacker could gain full control over the website, steal sensitive customer data, or cause a total service outage.
Technical details
The Reisen theme for WordPress is vulnerable to PHP Object Injection in versions up to and including 1.4.1. This vulnerability occurs due to the deserialization of untrusted data (CWE-502) provided by a user without proper validation. An unauthenticated remote attacker can exploit this by sending specially crafted input to the application. If a suitable POP (Property Oriented Programming) chain is present within the environment, the attacker can achieve remote code execution, perform SQL injection, or conduct path traversal. As of the advisory date, no official patch has been released by the vendor.
Affected products
- ThemeREX Reisen <= 1.4.1
Timeline
- 2025-10-15: other: Vulnerability reported by researcher
- 2026-05-26: advisory: Patchstack published initial advisory
- 2026-06-17: disclosed: CVE published to NVD