CVE-2026-57491 FileRise: ZIP extraction writes blocked file extensions to disk, bypassing the upload blocklist
Authenticated users can bypass upload restrictions by extracting blocked file extensions from ZIP archives, potentially leading to remote code execution.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-57491?
CVE-2026-57491 is a medium-severity vulnerability in error311 FileRise, published on 14 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
FileRise is a self-hosted web-based file manager with multi-file upload, editing, and batch operations. Prior to 3.16.0, FileRise archive extraction does not apply UploadNamePolicy::isAllowedForWrite() before ZipArchive::extractTo() writes entries into the destination directory. An authenticated user with upload and extract permissions can place a blocked extension such as a PHP-family file inside a ZIP and cause it to be written to disk even when normal uploads reject that filename. Post-extraction metadata pruning does not remove the blocked file, so deployments that execute uploaded content may permit code execution. This issue is fixed in version 3.16.0.
Weakness: CWE-434
Which versions are affected by CVE-2026-57491?
How do I fix CVE-2026-57491?
No fix has been published for CVE-2026-57491 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-57491 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-57491 exists.
Sources
Also known as GHSA-c4g2-8fg6-5xrr.