{"id":"GHSA-vwg3-w8w3-pc79","summary":"Grav: .htaccess file extension rules bypass via case variation on case-insensitive filesystems","details":"## Summary\n\nThe 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`).\n\n## Affected Versions\n\n- Grav 2.0.1 (latest stable as of June 2026) — confirmed\n- Grav 1.7.x — likely affected (same `.htaccess` rules)\n- All versions shipping the current `webserver-configs/htaccess.txt`\n\n## Affected Component\n\nFile: `.htaccess` (root of Grav installation)\nReference: `webserver-configs/htaccess.txt`\n\n## Affected Rules (lines 68, 70, 72)\n\n```apache\n# Line 68 — system/vendor file types\nRewriteRule ^(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]\n\n# Line 70 — user file types\nRewriteRule ^(user)/(.*)\\.(txt|md|json|yaml|yml|php|php2|php3|php4|php5|phar|phtml|pl|py|cgi|twig|sh|bat)$ error [F]\n\n# Line 72 — .md files globally\nRewriteRule \\.md$ error [F]\n```\n\nAll three rules use `[F]` without `[NC]`, making the extension match case-sensitive.\n\n## Steps to Reproduce\n\n1. Install Grav on a system with a case-insensitive filesystem:\n   - Windows (native WAMP/XAMPP)\n   - macOS (default HFS+)\n   - Docker on Windows/macOS with volume mounts (e.g., `./data:/var/www/html`)\n\n2. Create or use any plugin that stores sensitive data in its YAML config (e.g., API keys):\n   ```\n   user/plugins/my-plugin/my-plugin.yaml\n   ```\n\n3. Request the file with a case-varied extension:\n   ```\n   GET /user/plugins/my-plugin/my-plugin.YAML HTTP/1.1\n   ```\n\n4. **Expected**: HTTP 403 Forbidden\n5. **Actual**: HTTP 200 OK — full file contents returned, including any API keys or sensitive configuration\n\n## Impact\n\n- **Information disclosure**: Plugin configuration files (`.yaml`) containing API keys, credentials, or sensitive settings can be read by unauthenticated users\n- **Source code exposure**: PHP source files can be downloaded (instead of executed) when requested with `.PHP` extension on some configurations\n- **Configuration exposure**: `user/config/system.yaml`, `user/config/site.yaml`, and other system configuration files are accessible\n\n## Fix\n\nAdd the `[NC]` flag to the three affected rules:\n\n```apache\nRewriteRule ^(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,NC]\nRewriteRule ^(user)/(.*)\\.(txt|md|json|yaml|yml|php|php2|php3|php4|php5|phar|phtml|pl|py|cgi|twig|sh|bat)$ error [F,NC]\nRewriteRule \\.md$ error [F,NC]\n```\n\nThe `[NC]` flag makes the extension matching case-insensitive, covering `.YAML`, `.Yaml`, `.PHP`, `.Json`, etc.\n\n## Mitigating Factors\n\n- On native Linux with ext4 filesystem (case-sensitive), the attack does not work because Apache cannot resolve the uppercase filename to the actual file\n- Grav 2.0's Twig sandbox blocks access to `plugins` config subtree from page content, preventing SSTI-based config exfiltration\n- The `user/accounts/`, `user/config/`, and `user/data/` folders have separate rules (line 62, 66) that block ALL file types regardless of extension — these are not affected\n\n## Environment\n\n- Grav: 2.0.1\n- PHP: 8.3\n- Apache: 2.4 with mod_rewrite\n- OS: Docker (php:8.3-apache) with volume mounted from Windows 10 (NTFS)\n- Tested: June 2026\n\n## Reporter\n\nSisnetic","aliases":["CVE-2026-62230","CVE-2026-62673"],"modified":"2026-09-10T03:51:14.821574397Z","published":"2026-08-19T19:32:38Z","database_specific":{"github_reviewed_at":"2026-08-19T19:32:38Z","nvd_published_at":"2026-08-19T16:18:20Z","cwe_ids":["CWE-178"],"severity":"HIGH","github_reviewed":true},"references":[{"type":"WEB","url":"https://github.com/getgrav/grav/security/advisories/GHSA-vwg3-w8w3-pc79"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-62673"},{"type":"WEB","url":"https://github.com/getgrav/grav/commit/8c9d1e7b6fd66ecea80a4bc3783fd41d36e22fb1"},{"type":"PACKAGE","url":"https://github.com/getgrav/grav"},{"type":"WEB","url":"https://github.com/getgrav/grav/releases/tag/2.0.4"}],"affected":[{"package":{"name":"getgrav/grav","ecosystem":"Packagist","purl":"pkg:composer/getgrav/grav"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.4"}]}],"versions":["0.8.0","0.9.0","0.9.1","0.9.10","0.9.11","0.9.12","0.9.13","0.9.14","0.9.15","0.9.16","0.9.17","0.9.18","0.9.19","0.9.2","0.9.20","0.9.21","0.9.22","0.9.23","0.9.24","0.9.25","0.9.26","0.9.27","0.9.28","0.9.29","0.9.3","0.9.30","0.9.31","0.9.32","0.9.33","0.9.34","0.9.35","0.9.36","0.9.37","0.9.38","0.9.39","0.9.4","0.9.40","0.9.41","0.9.42","0.9.43","0.9.44","0.9.45","0.9.5","0.9.6","0.9.7","0.9.8","0.9.9","1.0.0","1.0.0-rc.1","1.0.0-rc.2","1.0.0-rc.3","1.0.0-rc.4","1.0.0-rc.5","1.0.0-rc.6","1.0.1","1.0.10","1.0.2","1.0.3","1.0.4","1.0.5","1.0.6","1.0.7","1.0.8","1.0.9","1.1.0","1.1.0-beta.1","1.1.0-beta.2","1.1.0-beta.3","1.1.0-beta.4","1.1.0-beta.5","1.1.0-rc.1","1.1.0-rc.2","1.1.0-rc.3","1.1.1","1.1.10","1.1.11","1.1.12","1.1.13","1.1.14","1.1.15","1.1.16","1.1.17","1.1.2","1.1.3","1.1.4","1.1.5","1.1.6","1.1.7","1.1.8","1.1.9","1.1.9-rc.1","1.1.9-rc.2","1.1.9-rc.3","1.2.0","1.2.0-rc.1","1.2.0-rc.2","1.2.0-rc.3","1.2.1","1.2.2","1.2.3","1.2.4","1.3.0","1.3.0-rc.1","1.3.0-rc.2","1.3.0-rc.3","1.3.0-rc.4","1.3.0-rc.5","1.3.1","1.3.10","1.3.2","1.3.3","1.3.4","1.3.5","1.3.6","1.3.7","1.3.8","1.3.9","1.4.0","1.4.0-beta.1","1.4.0-beta.2","1.4.0-beta.3","1.4.0-rc.1","1.4.0-rc.2","1.4.1","1.4.2","1.4.3","1.4.4","1.4.5","1.4.6","1.4.7","1.4.8","1.5.0","1.5.0-beta.1","1.5.0-beta.2","1.5.0-rc.1","1.5.1","1.5.10","1.5.2","1.5.3","1.5.4","1.5.5","1.5.6","1.5.7","1.5.8","1.5.9","1.6.0","1.6.0-beta.1","1.6.0-beta.2","1.6.0-beta.3","1.6.0-beta.4","1.6.0-beta.5","1.6.0-beta.6","1.6.0-beta.7","1.6.0-beta.8","1.6.0-rc.1","1.6.0-rc.2","1.6.0-rc.3","1.6.0-rc.4","1.6.1","1.6.10","1.6.11","1.6.12","1.6.13","1.6.14","1.6.15","1.6.16","1.6.17","1.6.18","1.6.19","1.6.2","1.6.20","1.6.21","1.6.22","1.6.23","1.6.24","1.6.25","1.6.26","1.6.27","1.6.28","1.6.29","1.6.3","1.6.30","1.6.31","1.6.4","1.6.5","1.6.6","1.6.7","1.6.8","1.6.9","1.7.0","1.7.0-beta.1","1.7.0-beta.10","1.7.0-beta.2","1.7.0-beta.3","1.7.0-beta.4","1.7.0-beta.5","1.7.0-beta.6","1.7.0-beta.7","1.7.0-beta.8","1.7.0-beta.9","1.7.0-rc.1","1.7.0-rc.10","1.7.0-rc.11","1.7.0-rc.12","1.7.0-rc.13","1.7.0-rc.14","1.7.0-rc.15","1.7.0-rc.16","1.7.0-rc.17","1.7.0-rc.18","1.7.0-rc.19","1.7.0-rc.2","1.7.0-rc.20","1.7.0-rc.3","1.7.0-rc.4","1.7.0-rc.5","1.7.0-rc.6","1.7.0-rc.7","1.7.0-rc.8","1.7.0-rc.9","1.7.1","1.7.10","1.7.12","1.7.13","1.7.14","1.7.15","1.7.16","1.7.17","1.7.18","1.7.19","1.7.20","1.7.21","1.7.22","1.7.23","1.7.24","1.7.25","1.7.26","1.7.26.1","1.7.27","1.7.27.1","1.7.28","1.7.29","1.7.29.1","1.7.3","1.7.30","1.7.31","1.7.32","1.7.33","1.7.34","1.7.35","1.7.36","1.7.37","1.7.37.1","1.7.38","1.7.39","1.7.39.1","1.7.39.2","1.7.39.3","1.7.39.4","1.7.4","1.7.40","1.7.41","1.7.41.1","1.7.41.2","1.7.42","1.7.42.1","1.7.42.2","1.7.42.3","1.7.43","1.7.44","1.7.45","1.7.46","1.7.47","1.7.48","1.7.49","1.7.49.1","1.7.49.2","1.7.49.3","1.7.49.4","1.7.49.5","1.7.5","1.7.51","1.7.52","1.7.53","1.7.53.1","1.7.53.2","1.7.53.3","1.7.6","1.7.7","1.7.8","1.7.9","1.8.0-beta.1","1.8.0-beta.10","1.8.0-beta.11","1.8.0-beta.12","1.8.0-beta.13","1.8.0-beta.14","1.8.0-beta.15","1.8.0-beta.16","1.8.0-beta.17","1.8.0-beta.18","1.8.0-beta.19","1.8.0-beta.2","1.8.0-beta.20","1.8.0-beta.21","1.8.0-beta.22","1.8.0-beta.23","1.8.0-beta.24","1.8.0-beta.25","1.8.0-beta.26","1.8.0-beta.27","1.8.0-beta.28","1.8.0-beta.29","1.8.0-beta.3","1.8.0-beta.4","1.8.0-beta.5","1.8.0-beta.6","1.8.0-beta.7","1.8.0-beta.8","1.8.0-beta.9","2.0.0","2.0.0-beta.1","2.0.0-beta.2","2.0.0-beta.3","2.0.0-beta.4","2.0.0-rc.1","2.0.0-rc.10","2.0.0-rc.2","2.0.0-rc.3","2.0.0-rc.4","2.0.0-rc.5","2.0.0-rc.6","2.0.0-rc.7","2.0.0-rc.8","2.0.0-rc.9","2.0.1","2.0.2","2.0.3"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-vwg3-w8w3-pc79/GHSA-vwg3-w8w3-pc79.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"}]}