CVE-2026-107763 hostspa CVE debrief

Who should care

WordPress administrators, security teams, and users with access to WordPress installations using the Fastcache by Host.it plugin should assess their exposure and prioritize remediation.

Why it matters

CVE-2026-107763 is an authorization bypass vulnerability in the Fastcache by Host.it WordPress plugin. It allows authenticated attackers with subscriber-level access to modify .htaccess files, posing security risks. WordPress administrators and security teams should assess exposure and prioritize remediation.

• Authenticated attackers with low privileges can modify .htaccess files, potentially leading to security risks.
• Compromised .htaccess files can lead to website defacement, malware distribution, or other malicious activities.
• Remediation requires updating the plugin to a fixed version or implementing compensating controls.
• Verification of user access controls and .htaccess file integrity is necessary.

Technical summary

The Fastcache by Host.it plugin for WordPress is vulnerable to authorization bypass due to improper verification of user authorization. This allows authenticated attackers with subscriber-level access and above to add or remove the plugin's page-cache rewrite rules in the site's root .htaccess file. The vulnerability arises from inadequate checks within the plugin's code, enabling unauthorized modifications to critical configuration files. To exploit this vulnerability, an attacker would need to have subscriber-level access or higher within the WordPress environment.

Defensive priority

Assess exposure and prioritize remediation for WordPress installations using the Fastcache by Host.it plugin, especially those with untrusted or unauthenticated users.

Recommended defensive actions

• Assess WordPress installations for the presence of the Fastcache by Host.it plugin, version 1.7.5 or earlier.
• Verify user access controls and ensure that only authorized personnel can modify .htaccess files.
• Consider implementing additional monitoring for changes to .htaccess files.
• Update the plugin to a version that fixes the authorization bypass vulnerability, if available.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.

Evidence notes

The vulnerability is due to improper authorization checks in the plugin. Authenticated attackers with subscriber-level access can modify the .htaccess file, potentially leading to security risks. The plugin does not verify that a user is authorized to perform actions, allowing unauthorized modifications to the site's root .htaccess file. This could result in the addition or removal of page-cache rewrite rules, compromising the security and integrity of the website. To verify the vulnerability, defenders should review the plugin's code

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.