External risk intelligence

Emlog Pro Arbitrary File Upload Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2025-25783

Emlog Pro is a web application designed to be deployed as a public-facing website. The vulnerable component, admin/plugin.php, is part of the administrative interface, which is commonly accessible over the internet in standard web deployments.

Unrestricted File Upload

Emlog

2.5.3

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 Emlog Pro software, specifically within its administrative plugin component, that could permit unauthorized code execution by attackers. This issue arises from the ability to upload specially crafted files, posing a significant risk if the affected software is exposed externally. The primary concern is to determine if our organization utilizes this software and, if so, to assess the extent of its exposure.

Allows file uploads for code execution.
Critical flaw in admin plugin component.
Confirm use and exposure.

Attack Path

How an attacker could exploit the issue

An attacker can exploit this vulnerability by uploading a specially crafted ZIP file through the administrative plugin interface of Emlog Pro. This could allow them to execute arbitrary code on the server, leading to a complete compromise of the affected system.

No special access required.
Upload a crafted ZIP file.
Arbitrary code execution.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow an unauthenticated attacker to upload and execute arbitrary code on a vulnerable Emlog Pro installation when a crafted zip file is uploaded. This could lead to the compromise of the entire system.

Arbitrary code execution.
Upload crafted zip file.
Full system compromise.

Operational Fix

Recommended remediation, mitigation, and detection steps

Real-World Ownership

This vulnerability impacts Emlog Pro, a web application. Platform or infrastructure teams managing the web server hosting Emlog Pro, and potentially application owners if the Emlog Pro instance is independently managed, should lead the response. The initial step involves identifying all Emlog Pro instances, assessing their internet exposure and business criticality, and confirming the accountable owner to prioritize remediation.

Platform and application owners should lead.
Verify internet exposure and business criticality.
Plan remediation based on identified risk.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

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Frequently asked questions

What is Emlog Pro?

Emlog Pro is a content management system used to build and maintain websites and blogs. It includes features for managing plugins, which extend the site's functionality. This vulnerability specifically affects the plugin management component within the administrative interface of version 2.5.3.

What does arbitrary file upload mean for CVE-2025-25783?

This vulnerability is classified as CWE-434, which refers to Unrestricted Upload of File with Dangerous Type. In this case, the system fails to properly validate files uploaded through the administrative interface. An attacker can use this weakness to upload a malicious ZIP file that the server subsequently treats as executable code, granting the attacker the ability to run commands on the underlying system.

How is the vulnerability in Emlog Pro triggered?

An attacker triggers this flaw by interacting with the admin/plugin.php component. The process requires uploading a specially crafted ZIP file through the plugin management interface. It is important to note that the vulnerability is not triggered by standard site usage or visiting the front-end blog; it specifically involves the mechanism designed for adding or managing site plugins.

Is my Emlog Pro installation at risk?

If you host an instance of Emlog Pro version 2.5.3, you are potentially at risk. According to Halo Surface Signal, Emlog Pro is typically deployed as a public-facing website, and the affected administrative component is often accessible over the internet in standard configurations. Instances exposed to the internet are at a higher risk of being reached by an unauthenticated attacker.

How should I respond to this Emlog Pro vulnerability?

Your first step is to locate all Emlog Pro instances across your environment to determine if version 2.5.3 is in use. Once identified, evaluate whether these instances are accessible from the internet and assess their business importance. Coordinate with your platform or application owners to prioritize these systems for remediation, ensuring that vulnerable plugin interfaces are secured or restricted.

References

www.emlog.net/

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.