Vulnerability · Published Oct 14, 2026 · Assigned by GitHub_M

CVE-2026-57491FileRise: ZIP extraction writes blocked file extensions to disk, bypassing the upload blocklist

Medium 6.5

In plain English

A medium-severity unrestricted file upload in FileRise from error311. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 29% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.3%top 71.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
error311	FileRise	< 3.16.0

Weakness: CWE-434 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

References

https://github.com/error311/FileRise/security/advisories/GHSA-c4g2-8fg6-5xrr x_refsource_CONFIRM
https://github.com/error311/FileRise/commit/f7114ca2a4e624238dda0d097a07ad6b05c11bb6 x_refsource_MISC
https://github.com/error311/FileRise/releases/tag/v3.16.0 x_refsource_MISC