{"id":"CVE-2026-107763","kind":"vulnerability","aliases":["CVE-2026-107763"],"related":[],"title":"Fastcache by Host.it WordPress plugin: subscribers can edit .htaccess rules","description":"The Fastcache by Host.it plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 1.7.5. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for 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.","summary":"The Fastcache by Host.it WordPress plugin up to and including 1.7.5 does not check authorization on an action, so a logged-in subscriber can add or remove its page-cache rewrite rules in the site's root .htaccess file. The attacker can change how the web server routes requests, which can disrupt or redirect site traffic.","severity":"medium","cvss":4.3,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["package","self-hosted","shared-hosting","wordpress"],"not_affected_if":["no-public-registration","plugin-not-installed"],"how_to_check":"- Check the installed plugin version in the WordPress admin under Plugins, or with `wp plugin get fastcache --field=version` if WP-CLI is available.\n- Look for a Fastcache rewrite block in the site's root `.htaccess` file.\n- Check whether open user registration is enabled with the default subscriber role.","fix":"- Update the Fastcache by Host.it plugin to a version later than `1.7.5`; the sources do not name the fixed version.\n- Until updated, disable open registration or remove the plugin if it is not needed.","status":"open","published_at":"2026-10-17T03:16:28+00:00","first_seen_at":"2026-10-23T21:57:14+00:00","triaged_at":"2026-10-25T04:39:55+00:00","updated_at":"2026-10-25T04:39:55+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-10-25T04:39:55Z","model":"claude-haiku-5-5","output":{"fix":"- Update the Fastcache by Host.it plugin to a version later than `1.7.5`; the sources do not name the fixed version.\n- Until updated, disable open registration or remove the plugin if it is not needed.","reach":"internet","title":"Fastcache by Host.it WordPress plugin: subscribers can edit .htaccess rules","impact":"medium","summary":"The Fastcache by Host.it WordPress plugin up to and including 1.7.5 does not check authorization on an action, so a logged-in subscriber can add or remove its page-cache rewrite rules in the site's root .htaccess file. The attacker can change how the web server routes requests, which can disrupt or redirect site traffic.","category":"package","nicknames":[],"who_cares":["wordpress","self-hosted","shared-hosting"],"confidence":0.7,"needs_auth":"yes","worst_case":"subscriber alters the site's .htaccess rewrite rules","analyst_note":"","how_to_check":"- Check the installed plugin version in the WordPress admin under Plugins, or with `wp plugin get fastcache --field=version` if WP-CLI is available.\n- Look for a Fastcache rewrite block in the site's root `.htaccess` file.\n- Check whether open user registration is enabled with the default subscriber role.","needs_analyst":false,"not_affected_if":["plugin-not-installed","no-public-registration"],"who_is_affected":"WordPress sites running the Fastcache by Host.it plugin at version 1.7.5 or earlier are exposed. The attacker needs a logged-in account with subscriber-level access, so sites that do not allow public signup or have no user accounts are much less exposed. Sites that do not run this plugin can skip it.","user_interaction":"no","needs_special_setup":"no","severity_if_unknown":"medium"},"cost_usd":0.000649,"input_tokens":3355,"output_tokens":627,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-107763':13A,16A '-2026':12A,15A '1.7.5':35B,102C 'access':132C 'action':42B,120C 'add':50B,136C 'attack':67B,127C 'authent':126C 'author':39B,93C,116C 'bypass':94C 'cach':56B,144C 'chang':69B 'check':38B 'cve':11A,14A 'disrupt':78B 'due':105C 'edit':8A 'fastcach':1A,26B,84C 'file':65B,153C 'host':20B,23B 'host.it':3A,28B,86C 'htaccess':9A,64B,152C 'includ':34B,101C 'level':131C 'log':46B 'logged-in':45B 'make':122C 'packag':17B 'page':55B,143C 'page-cach':54B,142C 'perform':118C 'plugin':5A,30B,87C,108C,140C 'possibl':124C 'proper':110C 'redirect':80B 'remov':52B,138C 'request':75B 'rewrit':57B,145C 'root':63B,151C 'rout':74B 'rule':10A,58B,146C 'self':19B 'self-host':18B 'server':73B 'share':22B 'shared-host':21B 'site':61B,81B,149C 'subscrib':6A,48B,130C 'subscriber-level':129C 'traffic':82B 'user':114C 'verifi':111C 'version':97C 'vulner':91C 'web':72B 'wordpress':4A,24B,29B,89C","nicknames":[],"mitigations":[],"who_affected":"WordPress sites running the Fastcache by Host.it plugin at version 1.7.5 or earlier are exposed. The attacker needs a logged-in account with subscriber-level access, so sites that do not allow public signup or have no user accounts are much less exposed. Sites that do not run this plugin can skip it.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-17T03:16:28+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","cvss_by":"security@wordfence.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-107763","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-107763","severity":null,"published_at":"2026-10-17T03:16:28+00:00","modified_at":"2026-10-19T15:16:45+00:00","first_seen_at":"2026-10-23T21:57:14+00:00","fetched_at":"2026-10-23T22:28:55+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}