CVE-2026-77427

FileRise before version 3.28.0 contains a privilege escalation vulnerability that allows authenticated low-privilege attackers to gain unauthorized read and write access by exploiting improper session isolation between the WebDAV interface and the web application session context. Attackers can combine valid Basic-Auth credentials with an active admin PHPSESSID cookie to bypass authorization boundaries.

FileRise before 3.16.0 is vulnerable to path traversal in the shared-folder upload endpoint (/api/folder/uploadToSharedFolder.php), leading to arbitrary file write and administrator account takeover. The upload filename validation permits URL-encoded sequences.

FileRise is a self-hosted web-based file manager. Prior to 3.21.0, FileRise returns the stored branding.footerHtml value through the unauthenticated public site configuration API without server-side sanitization. The FileRise frontend already sanitizes this value before rendering it into the page, but the unauthenticated public config API exposed raw admin-provided footer HTML to clients. An administrator must first store the malicious footer value. This issue is fixed in version 3.21.0.

FileRise is a self-hosted web-based file manager. Prior to 3.21.0, FileRise tracks failed logins only by the combination of source IP address and username. A remote unauthenticated attacker can rotate usernames to obtain a fresh per-account attempt budget for each name, enabling password spraying from one source beyond the intended limit. This issue is fixed in version 3.21.0.

FileRise is a self-hosted web-based file manager. Prior to 3.21.0, FileRise enforces disableFormLogin, disableBasicAuth, and disableOIDCLogin in the client interface but not consistently in the corresponding server-side authentication flows. A user with otherwise valid credentials for a disabled method can call its backend endpoint directly and authenticate despite the administrator's login-method policy. This issue is fixed in version 3.21.0.

Prior to 3.20.0, FileRise /api/file/snippet.php does not apply the standard authenticated-session guard before processing short text preview requests. The endpoint still performs FileRise ACL checks, so normal installations do not expose an unauthenticated arbitrary file read, but unauthenticated requests can reach ACL evaluation instead of receiving an immediate 401 response. Only additional unusual proxy-header or ACL misconfiguration is documented as allowing requests to proceed into path and file-content handling.

FileRise prior to 3.19.0 does not reject dot-dot path segments in the folderName string before FolderModel::createFolder() constructs and creates the destination. An authenticated low-privileged user with a valid CSRF token and create or owner permission on the parent can submit traversal segments to POST /api/folder/createFolder.php and create directories outside UPLOAD_DIR.

Prior to 3.18.0, FileRise flattens logical folder paths into metadata filenames by replacing separators and spaces with hyphens, so distinct folders such as team/docs and team-docs can share one metadata file. A low-privileged user who controls one colliding folder and knows the target basename can alter the metadata, make the victim file appear attacker-owned, then read and modify it.

Prior to 3.18.0, FileRise upload-enabled shared-folder and upload-only links do not reject a destination filename that already exists. An unauthenticated visitor with a valid share token and password can upload a file with the same name and silently replace its content while the original uploader metadata remains. The same gap affects ordinary authenticated uploads via /api/upload/upload.php and authenticated upload-only users lacking edit authority.

FileRise prior to 3.16.0 stores the isAdmin flag in remember-me tokens and restores that stale value during automatic login instead of resolving the account's current role from users.txt. A user who was issued a token while an administrator can retain administrator access after demotion, and token rotation copies the stale privilege into each replacement token.