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[webapps] Quick Playground for WordPress 1.3.1 - Unauthenticated Remote Code Execution

The Quick Playground for WordPress plugin (versions up to and including 1.3.1) contains a critical vulnerability (CVE-2026-1830, CVSS 9.8) allowing unauthenticated remote code execution. Attackers can exploit an insufficiently protected REST API endpoint (`/wp-json/quickplayground/v1/upload_image/{profile}`) by using a known or predictable `sync_code` to upload arbitrary files, including PHP webshells, via path traversal.
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