CVE-2026-15321 in MyEMS
Summary
by MITRE • 07/10/2026
A vulnerability was found in MyEMS up to 6.4.0. The affected element is the function on_post of the file myems-api/core/svg.py of the component Admin Backend. The manipulation of the argument new_values['data'] results in cross site scripting. The attack can be launched remotely. The exploit has been made public and could be used. Upgrading to version 6.5.0 is sufficient to fix this issue. The patch is identified as 4a97edfbd786c779d0322054833b21ddf54d5b06. It is suggested to upgrade the affected component. The issue report remains open even though there is an official fix for it.
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Analysis
by VulDB Data Team • 07/10/2026
The vulnerability identified in MyEMS version 6.4.0 and earlier represents a critical cross-site scripting flaw within the Admin Backend component, specifically affecting the on_post function in the myems-api/core/svg.py file. This security weakness stems from inadequate input validation and sanitization of user-supplied data, particularly the new_values['data'] argument that flows directly into the SVG generation process without proper escaping or filtering mechanisms.
The technical implementation of this vulnerability occurs when an attacker submits malicious data through the Admin Backend interface, specifically targeting the SVG processing functionality. The function fails to properly sanitize the input before incorporating it into dynamically generated SVG content, creating an environment where malicious script code can be injected and subsequently executed within the context of a victim's browser session. This type of flaw aligns with CWE-79 - Improper Neutralization of Input During Web Page Generation, which categorizes the issue as a classic XSS vulnerability that allows attackers to execute arbitrary JavaScript in the victim's browser.
From an operational perspective, this remote exploit presents significant risks to organizations using MyEMS versions prior to 6.5.0, as it enables attackers to perform session hijacking, defacement of administrative interfaces, data exfiltration, and potential lateral movement within compromised environments. The fact that a public exploit exists amplifies the severity, as it removes the need for sophisticated attack development and makes this vulnerability immediately actionable by threat actors. The attack vector through the Admin Backend interface means that successful exploitation could provide attackers with administrative privileges over the entire MyEMS system, potentially leading to complete system compromise.
The remediation strategy involves upgrading to version 6.5.0, which contains the official patch identified by the commit hash 4a97edfbd786c779d0322054833b21ddf54d5b06. This upgrade addresses the root cause by implementing proper input sanitization and output encoding mechanisms for SVG data processing. Organizations should also consider implementing additional defensive measures such as web application firewalls, content security policies, and regular security assessments to mitigate similar vulnerabilities in other components. The vulnerability's classification aligns with ATT&CK technique T1566.002 - Phishing: Spearphishing Attachment, as the exploitation could occur through malicious file uploads or crafted SVG content delivered via phishing campaigns. Given the open nature of the issue report despite the official fix, administrators should prioritize immediate remediation to prevent potential exploitation in active environments.