Unauthenticated PHP Object Injection Vulnerability in Roisin Theme by WordPress
CVE-2026-40754

8.1HIGH

Key Information:

Vendor

WordPress
Status
Roisin
Vendor
CVE Published:
16 June 2026

What is CVE-2026-40754?

The Roisin theme for WordPress, specifically versions up to 1.4, is susceptible to an unauthenticated PHP Object Injection vulnerability. This issue allows for attackers to exploit the application and potentially execute arbitrary PHP code by manipulating serialized objects. Additionally, it poses a risk of executing unwanted actions on behalf of authenticated users, leading to further security breaches. It is crucial for users of the Roisin theme to apply necessary patches and updates to mitigate this risk effectively.

Affected Version(s)

Roisin <= 1.4

References

https://patchstack.com/database/wordpress/theme/roisin/vu...
vdb-entry

CVSS V3.1

Score:
8.1
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Denver Jackson | Patchstack Bug Bounty Program
.