CVE-2026-26351
MediumCVSS 4.8Exploitation Probability (EPSS)
Low risk21th percentile - higher than 21% of all known CVEs
Summary
GetSimpleCMS Community Edition prior to version 3.3.22 contains a stored XSS vulnerability in the Theme to Components functionality in components.php. The "slug" field of a component is stored without proper output encoding, allowing arbitrary JavaScript execution in the admin interface.
Risk Assessment
An authenticated administrator can inject malicious script that executes whenever any authenticated user views the Components page. This can lead to session hijacking, unauthorized administrative actions, and persistent compromise of the CMS admin interface.
Recommendation
Immediately update GetSimpleCMS Community Edition to version 3.3.22 or later. If updating is not possible, restrict access to the admin interface to trusted users only.
Original NVD description (English source)
GetSimpleCMS Community Edition (CE) versions prior to 3.3.22 (3.3.16 tested) contains a stored cross-site scripting (XSS) vulnerability in the Theme to Components functionality within components.php. User-supplied input provided to the "slug" field of a component is stored without proper output encoding. While other fields are sanitized using safe_slash_html(), the slug parameter is written to XML and later rendered in the administrative interface without sanitation, resulting in persistent execution of arbitrary JavaScript. An authenticated administrator can inject malicious script content that executes whenever the affected Components page is viewed by any authenticated user, enabling session hijacking, unauthorized administrative actions, and persistent compromise of the CMS administrative interface.