CVE-2026-63353 in SIMATIC ET 200SP CPU 1510SP F-1 PN
Summary
by MITRE • 10/13/2026
Affected devices do not properly sanitize comment fields contained in imported trace files before rendering them on the Trace page.
This could allow an attacker to social engineer an authorized user who holds the function right “Read diagnostics” into importing a specially crafted trace file. Successful exploitation could allow attacker-controlled JavaScript to execute in the user’s browser session and perform PLC operations through the web server within the scope of the user’s authorization.
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Analysis
by VulDB Data Team • 10/13/2026
The vulnerability described constitutes a critical Cross-Site Scripting (XSS) flaw embedded within the industrial control system's diagnostic interface, specifically affecting how imported trace files are processed and rendered. The core technical deficiency lies in the application's failure to properly sanitize comment fields contained within these trace files before they are displayed on the Trace page. This lack of input validation allows malicious actors to inject executable JavaScript code into what is ostensibly a benign data field. When an authorized user imports such a crafted file, the web server renders the content without stripping or encoding the script tags, leading directly to client-side execution within the victim's browser session.
From a threat modeling perspective, this vulnerability relies heavily on social engineering as its primary attack vector. The attacker must trick a privileged user into importing a specially constructed trace file, exploiting human trust rather than purely technical exploits of network protocols or authentication mechanisms. This aligns with the MITRE ATT&CK technique T1566.002, which covers Spearphishing Attachment, although in this context, it manifests as spear-phishing via malicious data files intended for system diagnostics. The requirement that the victim holds the Read diagnostics function right further narrows the attack surface to insiders or those who have gained access through credential theft and social engineering tactics targeting operational technology personnel.
The operational impact of this vulnerability is severe due to its direct linkage with Programmable Logic Controller (PLC) operations. Unlike typical XSS vulnerabilities that might only steal session cookies or deface web pages, this flaw allows the attacker-controlled JavaScript to interact directly with the PLC through the web server interface. This means an attacker can execute commands within the scope of the user's authorization level, potentially leading to unauthorized control over industrial processes, disruption of production lines, or even physical damage to equipment if safety interlocks are bypassed. The ability to perform PLC operations remotely via a browser session represents a significant escalation from information disclosure to active system compromise and operational disruption.
This issue maps directly to CWE-79, which describes Improper Neutralization of Input During Web Page Generation known as Cross-site Scripting. Furthermore, it relates to CWE-20, the General Problem with Proper Input Validation, indicating that the application does not adequately filter or escape special characters in user-supplied input before including it in web pages. The severity is amplified by the context of industrial control systems where availability and integrity are paramount security pillars alongside confidentiality.
Mitigation strategies must focus on both immediate remediation and long-term architectural improvements. Immediately, vendors should release a patch that enforces strict output encoding for all data rendered to the Trace page, ensuring that any special characters in comment fields are escaped or encoded so they cannot be interpreted as executable code by the browser. Additionally, implementing Content Security Policy (CSP) headers can significantly reduce the impact of such vulnerabilities by restricting the sources from which scripts can be loaded and executed. For users unable to patch immediately, administrative controls should restrict who has access to import trace files, limiting exposure to only essential personnel with strong security awareness training regarding social engineering tactics. Regular audits of input validation logic across all diagnostic interfaces are also recommended to prevent similar flaws in other modules.