If you found this string in your web server logs, it likely means someone (or an automated bot) was probing your site for XSS vulnerabilities. Ensure your application uses context-aware output encoding and a strong Content Security Policy (CSP) to mitigate these risks.
: Likely a unique, random string used as a "marker" to identify this specific injection attempt during automated scanning. <'"> : This is the core "polyglot" section: < : Tests if the application allows opening HTML tags.
The string "{KEYWORD}'NYWpxO<'">tYeTVq" appears to be a specialized or a WAF (Web Application Firewall) bypass payload used in security testing. Technical Breakdown
tYeTVq" srcset="https://cdn-64b2c372c1ac1820c44fdd27.closte.com/wp-content/uploads/2023/05/Logo-nero-trasp.-stretto.png 1098w, https://cdn-64b2c372c1ac1820c44fdd27.closte.com/wp-content/uploads/2023/05/Logo-nero-trasp.-stretto-300x130.png 300w, https://cdn-64b2c372c1ac1820c44fdd27.closte.com/wp-content/uploads/2023/05/Logo-nero-trasp.-stretto-1024x444.png 1024w, https://cdn-64b2c372c1ac1820c44fdd27.closte.com/wp-content/uploads/2023/05/Logo-nero-trasp.-stretto-768x333.png 768w" sizes="(max-width: 1098px) 100vw, 1098px"/> 
tYeTVq" srcset="https://cdn-64b2c372c1ac1820c44fdd27.closte.com/wp-content/uploads/2023/05/Logo-bianco-sfondo-trasparente-1024x1024.png 1024w, https://cdn-64b2c372c1ac1820c44fdd27.closte.com/wp-content/uploads/2023/05/Logo-bianco-sfondo-trasparente-300x300.png 300w, https://cdn-64b2c372c1ac1820c44fdd27.closte.com/wp-content/uploads/2023/05/Logo-bianco-sfondo-trasparente-150x150.png 150w, https://cdn-64b2c372c1ac1820c44fdd27.closte.com/wp-content/uploads/2023/05/Logo-bianco-sfondo-trasparente-768x768.png 768w, https://cdn-64b2c372c1ac1820c44fdd27.closte.com/wp-content/uploads/2023/05/Logo-bianco-sfondo-trasparente-1536x1536.png 1536w, https://cdn-64b2c372c1ac1820c44fdd27.closte.com/wp-content/uploads/2023/05/Logo-bianco-sfondo-trasparente.png 1538w" sizes="(max-width: 800px) 100vw, 800px"/>