If you are running HtmlY 2.7.5, assume your site is compromised. Follow these steps immediately.
The vulnerability resides in the file upload functionality intended for site assets (images, downloads). In a properly configured system, several gates should exist: htmly 2.7.5 exploit
The HTMLy 2.7.5 exploit is not merely a technical curiosity; it is a case study in how minimalism, when divorced from rigorous security engineering, becomes a liability. Flat-file CMS offer elegance and speed, but they transfer complexity from the database layer to the filesystem layer—where the consequences of a single oversight are immediate system compromise. As developers continue to build lightweight tools, the industry must internalize that every file upload is a potential shell, every directory writable by the web server is a risk, and every skipped authentication check is an open door. In the end, security is not a feature to be added; it is a property of the entire design. HTMLy 2.7.5 forgot this—and paid the price of becoming a textbook exploit. If you are running HtmlY 2
In version 2.7.5, the file upload handler ( /admin/inc/upload.php ) failed to properly validate file extensions and MIME types. Specifically, the script relied on a blacklist approach: In a properly configured system, several gates should