{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-54090: File Browser: Command Allowlist Bypass via Shell Metacharacter Injection","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-54090","status":"final","version":"1","initial_release_date":"2026-06-25T17:51:17.656Z","current_release_date":"2026-06-25T17:51:17.656Z","revision_history":[{"date":"2026-06-25T17:51:17.656Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"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.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-54090 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-54090"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-54090"},{"category":"external","summary":"https://github.com/filebrowser/filebrowser/security/advisories/GHSA-8c9q-7855-wfxq","url":"https://github.com/filebrowser/filebrowser/security/advisories/GHSA-8c9q-7855-wfxq"},{"category":"external","summary":"https://github.com/filebrowser/filebrowser/issues/5199","url":"https://github.com/filebrowser/filebrowser/issues/5199"}]},"product_tree":{"branches":[{"category":"vendor","name":"filebrowser","branches":[{"category":"product_name","name":"filebrowser","branches":[{"category":"product_version","name":"< 2.33.8","product":{"name":"filebrowser filebrowser < 2.33.8","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:filebrowser:filebrowser:\\<_2.33.8:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-54090","title":"File Browser: Command Allowlist Bypass via Shell Metacharacter Injection","notes":[{"category":"description","text":"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.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1"]},"scores":[{"cvss_v4":{"version":"4.0","vectorString":"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","baseScore":8.7,"baseSeverity":"HIGH"},"products":["CSAFPID-1"]}],"remediations":[{"category":"none_available","details":"No fixed version is published yet. Monitor the upstream advisory.","product_ids":["CSAFPID-1"]}]}]}