MDaemon Email Server JavaScript Execution Vulnerability (CVE-2024-11182)

Historical catalog analysis: CISA added this entry on May 19, 2025. The entry reflects catalog information retrieved on August 31, 2026, not a snapshot archived on the inclusion date. Check current vendor guidance before acting.

What the vulnerability is

CVE-2024-11182 is a Cross-Site Scripting (XSS) vulnerability (CWE-79) identified in the MDaemon Email Server. The flaw allows a remote attacker to load and execute arbitrary JavaScript code on a target system by sending a specially crafted HTML email message.

Exposure and applicability

This vulnerability affects organizations utilizing MDaemon Email Server for their mail infrastructure. Because the attack vector is an HTML email, the exposure path is direct: any user or administrator who views a malicious email through the affected server’s interface could be subject to the execution of unauthorized JavaScript.

Remediation priorities

Based on our analysis, vulnerability management teams should prioritize the following actions to reduce exposure:

1. Identify Affected Assets: Locate all active instances of MDaemon Email Server within the environment to determine the scope of exposure.
2. Apply Vendor Updates: Deploy critical updates and mitigations as specified in the vendor’s release notes and critical updates documentation. This is the primary method for addressing the underlying flaw.
3. Review Mail Filtering: While not a replacement for patching, evaluating existing mail gateway filters to identify or block suspicious HTML patterns could potentially reduce the volume of malicious payloads reaching the server.

How to validate remediation

Verification must move beyond simple version checks, as a deployed update does not always guarantee that the vulnerability is neutralized in every configuration. We recommend the following validation approach:

• Functional Testing: In a non-production environment, security teams should attempt to send an HTML email containing benign JavaScript (e.g., a simple alert box) to verify if the server correctly sanitizes or blocks the execution of the script.
• Configuration Audit: Confirm that the updates were applied across all nodes in a clustered or distributed deployment to ensure no vulnerable instances remain active.

Limits and open questions

It remains unknown whether this vulnerability has been leveraged in ransomware campaigns. Additionally, while vendor updates are available, there is residual risk if users interact with malicious content through third-party clients that may handle HTML rendering differently than the MDaemon server itself. Defenders should note that CISA’s mandated remediation deadline of June 9, 2025, applies specifically to covered federal agencies and serves as a benchmark for urgency rather than a universal legal requirement.

Source and editorial note

CVE-2024-11182: MDaemon Email Server Cross-Site Scripting (XSS) Vulnerability · Source date: May 19, 2025 · Retrieved August 31, 2026.

Material facts are tied to the cited primary source. Recommendations are independent defensive analysis unless attributed to the source. Confirm consequential decisions against current authoritative guidance.

Archive date: May 22, 2025. The displayed post date is assigned three days after the source date to organize this retrospective archive; it does not mean this site published the analysis then. First published by this site: October 14, 2026 at 00:23 UTC.

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