CVE-2026-54090
CVE-2026-54090 is a high-severity vulnerability with a CVSS 4.0 base score of 8.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-77.
Key facts
- Severity: High (CVSS 4.0 base score 8.7)
- EPSS exploit prediction: 0% (24th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-39511
- Weakness: CWE-77
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2026-54090?
- 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.
- How severe is CVE-2026-54090?
- CVE-2026-54090 has a CVSS 4.0 base score of 8.7, rated high severity.
- Is CVE-2026-54090 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-54090?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- Does CVE-2026-54090 have an EU (EUVD) identifier?
- Yes. CVE-2026-54090 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39511.
- When was CVE-2026-54090 published?
- CVE-2026-54090 was published on 2026-06-25 and last updated on 2026-06-26.
References
- https://github.com/filebrowser/filebrowser/issues/5199
- https://github.com/filebrowser/filebrowser/security/advisories/GHSA-8c9q-7855-wfxq
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