External risk intelligence

Reisen Theme PHP Object Injection Vulnerability.

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2025-69111

The vulnerability exists in a WordPress theme, which is by design a public-facing web component. Web applications are commonly deployed as internet-facing services, making the exposed surface area highly reachable in standard deployments.

Deserialization

Halo Surface Signal: 4 out of 5 — likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A critical vulnerability has been identified in the Reisen software, specifically related to PHP object injection, which could allow unauthenticated attackers to compromise systems. This issue affects external-facing web applications and poses a significant risk if exploited.

Unauthenticated code execution in Reisen software.
Critical risk for external-facing web applications.
Confirm relevance and understand potential exposure.

Attack Path

How an attacker could exploit the issue

An unauthenticated attacker can exploit this vulnerability by sending a crafted request to a vulnerable server. This request targets a PHP object injection flaw in the Reisen theme, potentially leading to a complete compromise of the affected website.

No authentication required to attack.
Triggered by sending a malicious request.
Allows remote code execution.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow an unauthenticated attacker to inject PHP objects into the system. When supported by the advisory, this could lead to unauthorized access to or modification of sensitive information, or disrupt service operations, particularly when the affected component is accessible over the network.

System data and sensitive information.
Via network requests when supported.
Unauthorized access or service disruption.

Operational Fix

Recommended remediation, mitigation, and detection steps

This unauthenticated PHP Object Injection vulnerability impacts the Reisen theme, likely affecting web application owners or platform teams responsible for managing WordPress installations. The immediate priority is to locate all instances of the affected theme, determine their exposure and criticality, identify the accountable owners, and then plan remediation according to the identified risk.

Application or platform owners should take charge.
Verify theme presence and exposure first.
Plan coordinated updates or vendor engagement.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

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Frequently asked questions

What is the Reisen theme?

Reisen is a software theme designed for the WordPress platform. WordPress themes serve as the visual and functional framework that dictates how a website appears and behaves for its visitors. By managing site layouts and user interactions, these themes act as integrated components within the web server environment, executing server-side code to render pages dynamically.

What does PHP object injection mean for CVE-2025-69111?

This vulnerability falls under the CWE-502 weakness class, which involves improper deserialization of data. In plain terms, the software accepts and processes user-supplied data without sufficient verification, allowing an attacker to inject unauthorized PHP objects. This can trick the application into executing unintended code, potentially granting the attacker complete control over the affected system's processes.

How is this vulnerability triggered?

An attacker triggers this flaw by sending a specifically crafted, malicious network request to the vulnerable server. Crucially, the system does not require any login or user credentials to process the request, meaning the flaw is reachable by anyone with network access. Interactions that do not include this malicious, specially formatted object data will not trigger the vulnerability.

Is my website at risk from this CVE?

According to the Halo Surface Signal, this vulnerability is classified as likely to be relevant because Reisen is a WordPress component intended for public-facing web functions. Because web applications are frequently deployed to be reachable over the internet, components like this are often accessible to any remote actor, significantly increasing the likelihood of risk compared to internal-only systems.

What are the first steps to address this threat?

Begin by auditing your environment to locate all installations where the Reisen theme is active. Once identified, confirm which instances are accessible via the network to prioritize your response. Engage with your platform administrators to determine the status of the affected software and coordinate a plan to update the theme or mitigate the risk through vendor-provided patches.

References

patchstack.com/database/wordpress/theme/reisen/vulnerability/wordpre…

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.