CVE-2026-62673

Summary The default .htaccess shipped with Grav (and the reference webserver-configs/htaccess.txt) contains security rules that block direct HTTP access to sensitive file types (.yaml, .yml, .php, .json, .twig, etc.) under user/ and system/vendor/ directories. However, these rules lack the [NC] (No Case) flag, making them case-sensitive. On case-insensitive filesystems (Windows/NTFS, macOS/HFS+, or Linux with Docker volumes mounted from Windows/macOS), an attacker can bypass these rules by requesting files with uppercase extensions (e.g., .YAML, .PHP, .JSON). Affected Versions - Grav 2.0.1 (latest stable as of June 2026) — confirmed - Grav 1.7.x — likely affected (same .htaccess rules) - All versions shipping the current webserver-configs/htaccess.txt Affected Component File: .htaccess (root of Grav installation) Reference: webserver-configs/htaccess.txt Affected Rules (lines 68, 70, 72) Line 68 — system/vendor file types RewriteRule ^(system|vendor)/(.*)\.(txt|xml|md|html|htm|shtml|shtm|json|yaml|yml|php|php2|php3|php4|php5|phar|phtml|pl|py|cgi|twig|sh|bat)$ error [F] Line 70 — user file types RewriteRule ^(user)/(.*)\.(txt|md|json|yaml|yml|php|php2|php3|php4|php5|phar|phtml|pl|py|cgi|twig|sh|bat)$ error [F] Line 72 — .md files globally RewriteRule \.md$ error [F] All three rules use [F] without [NC], making the extension match case-sensitive. Steps to Reproduce 1. Install Grav on a system with a case-insensitive filesystem: - Windows (native WAMP/XAMPP) - macOS (default HFS+) - Docker on Windows/macOS with volume mounts (e.g., ./data:/var/www/html) 2. Create or use any plugin that stores sensitive data in its YAML config (e.g., API keys): user/plugins/my-plugin/my-plugin.yaml 3. Request the file with a case-varied extension: GET /user/plugins/my-plugin/my-plugin.YAML HTTP/1.1 4. Expected: HTTP 403 Forbidden 5. Actual: HTTP 200 OK — full file contents returned, including any API keys or sensitive configuration Impact - Information disclosure: Plu

[![CVE-2026-62673 status](https://www.csirts.com/badge/CVE-2026-62673)](https://www.csirts.com/cve/CVE-2026-62673)