Vulnerability · Published Jun 25, 2026 · Assigned by GitHub_M
CVE-2026-54090File Browser: Command Allowlist Bypass via Shell Metacharacter Injection
High 8.7
In plain English
A high-severity command injection in filebrowser from filebrowser. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
File Browser is a file managing interface for uploading, deleting, previewing, renaming, and editing files within a specified directory. Prior to 2.33.8, when a shell interpreter is configured (e.g. /bin/sh -c), the command allowlist can be bypassed through shell metacharacters. The allowlist validates only the first token of user input, but the entire raw string is handed to the shell — semicolons, pipes, backticks, and $() all work to chain arbitrary commands after a permitted one. This vulnerability is fixed in 2.33.8.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/filebrowser/filebrowser | no fix listed | GO-2026-5250 |
| Go | github.com/filebrowser/filebrowser/v2 | 2.33.8 | GHSA-8c9q-7855-wfxq |
| Go | github.com/filebrowser/filebrowser/v2 | 2.33.8 | GO-2026-5250 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| filebrowser | filebrowser | < 2.33.8 |
Weakness: CWE-77, CWE-184 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
References
- https://github.com/filebrowser/filebrowser/security/advisories/GHSA-8c9q-7855-wfxq x_refsource_CONFIRM
- https://github.com/filebrowser/filebrowser/issues/5199 x_refsource_MISC