CVE-2026-63353
CriticalCVSS 9.6Summary
Affected devices do not properly sanitize comment fields contained in imported trace files before rendering them on the Trace page. An attacker can socially engineer an authorized user with the 'Read diagnostics' right into importing a crafted trace file.
Risk Assessment
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 user's authorization scope.
Recommendation
Restrict trace file imports to trusted sources and apply least privilege to the 'Read diagnostics' function until the vendor releases a fix.
Other vulnerabilities in Trace page
See all- CVE-2026-63354Critical
Affected devices do not properly validate and sanitize visual marker data contained in imported CSV trace files before rendering it on the Trace page. An attacker can socially engineer an authorized user with the 'Read diagnostics' right into importing a crafted trace file.
- CVE-2026-63350Critical
Affected devices do not properly restrict executable content contained in imported trace files. An attacker can socially engineer an authorized user with the 'Read diagnostics' right into importing a crafted trace file.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS