Quick.Cms CVE-2025-9980

No vendor-released patch or fixed version was identified at time of analysis: the vendor was notified early but did not respond with vulnerability details, an affected version range, or a fix, so there is no exact upgrade target to cite. The most effective compensating control is to harden the page editor itself - enforce server-side output encoding and sanitization of the pages-form content on render (for example an HTML sanitizer with a strict allowlist), and explicitly disable the configuration or plugin that permits raw HTML/JavaScript entry by administrators; the trade-off is that legitimate embedded content or rich formatting may need to be re-implemented through the sanitizer's allowlist. As a second layer, deploy a Content-Security-Policy header that disallows inline script and restricts script-src to trusted origins, which blocks the injected payload from executing even if it is stored, at the cost of potentially breaking legitimate inline scripts on the site. Because exploitation requires a high-privilege admin account, restrict administrative access to a trusted network or VPN, enforce unique credentials and MFA on admin logins, and monitor administrator account activity for unauthorized page edits; note that these reduce but do not eliminate the risk from a malicious insider or an already-compromised admin session. Until a vendor fix exists, treat Quick.Cms 6.8 as untrusted for admin-authored rich content and periodically audit stored page bodies for injected markup. Monitor https://cert.pl/posts/2025/10/CVE-2025-9980 and https://opensolution.org/cms-system-quick-cms.html for a vendor advisory, and validate any remediation against a test instance before rolling it out.