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Fastcache by Host.it vulnerabilities
Fastcache by Host.it has 1 known vulnerability in this database. The most recent published record is dated 10 Oct 2026.
- Known vulnerabilities
- 1
- Active installs
- 1,000+
- Latest version
- 1.7.6
- Last updated
- 9 Oct 2026
- Most recent
- 10 Oct 2026
Find it in your WordPress dashboard under Plugins. Severity is based on the CVSS score published with the CVE where one is available.
| Vulnerability | Severity | Affected | Fix | Published |
|---|---|---|---|---|
| Remote code execution CVE-2026-104021 | High 7.2 | Up to 1.7.4 | Fixed in a later version (latest 1.7.6) | 59 min ago |
Read the published descriptions
- CVE-2026-104021, 10 Oct 2026
- The Fastcache by Host.it plugin for WordPress is vulnerable to Code Injection in all versions up to, and including, 1.7.4 via the `fastcache_settings[cache_cookie_exclude][]` parameter. This is due to the plugin registering the `cache_cookie_exclude` setting via `register_setting()` without a `sanitize_callback`, while `buildSiteHtaccessRules()` applies only `trim()` to each cookie value before interpolating it directly into an Apache `RewriteCond` line - a normalization that strips surrounding whitespace but leaves embedded newlines intact, allowing an attacker to break out of the capture group and append arbitrary directives. This makes it possible for authenticated attackers, with administrator-level access and above, to inject arbitrary Apache directives into the site's `.htaccess` file via `file_put_contents()`, enabling server-level configuration changes such as setting `php_value auto_prepend_file` to execute attacker-controlled PHP code on every request. CVE record
What to do if you run Fastcache by Host.it
If you run Fastcache by Host.it, open WordPress and check the installed version in Plugins. Compare it with the affected versions in the vulnerability record. If a fixed version is available, take a current backup and update to that version or the latest supported release.
If no fixed version exists, consider disabling and removing the plugin or replacing it with a maintained alternative. After dealing with the affected software, check administrator users, unexpected file changes, redirects, unfamiliar pages and security logs for signs that the site may already have been altered.
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