FileBrowser Quantum Information Disclosure and XSS

Stored cross-site scripting in FileBrowser versions prior to 1.3.1-beta and 1.2.2-stable allows authenticated attackers to inject malicious scripts through share metadata fields that are improperly rendered without HTML escaping. When victims visit affected share URLs, the injected scripts execute in their browsers with full privileges, potentially leading to session hijacking, credential theft, or further compromise. A patch is available in the fixed versions, though exploitation currently shows 0% adoption likelihood.

FileBrowser versions prior to 1.3.1-beta and 1.2.2-stable leak authentication tokens through the /public/api/share/info endpoint, allowing unauthenticated attackers to bypass password protections on shared files. The vulnerability stems from an incomplete fix to CVE-2026-27611 and enables token disclosure that could facilitate unauthorized file access. No patch is currently available for affected installations.