CVE-2026-73243

kkFileView 4.2.0 and later is vulnerable to Server-Side Request Forgery in the /getCorsFile endpoint. The TrustHostFilter validates the first non-empty parameter in a fixed priority order, while the controller only reads and fetches urlPath, allowing bypass of the trust.host whitelist by supplying both urlPath (real target) and url (whitelisted decoy), with the response body echoed back to the attacker.

kkFileView versions 5.0.0 through 5.0.2 contain a directory traversal vulnerability in FileController.java. The fileUpload, createFolder and existsFile endpoints accept a "path" parameter that is concatenated into the upload base path without validation, allowing unauthenticated attackers to create arbitrary directories and write arbitrary files outside the intended fileDir root via a crafted multipart request.

kkFileView 5.0.0 through 5.0.2 allows reflected XSS via the /onlinePreview endpoint. The OnlinePreviewController passes the user-controlled page and kkagent request parameters to FreeMarker templates without sanitization, and the templates insert these values into raw JavaScript contexts.

kkFileView prior to 5.0.1 has an unauthenticated POST /listFiles endpoint that passes the user-controlled path parameter to Files.newDirectoryStream without confinement to the demo directory, allowing directory enumeration outside the intended root.