What’s Vulnerable › Vulnerabilities

CVE-2026-72834: filebrowser before 2.63.19 Permission Bypass via checksum

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-14 · updated 2026-09-08
• Weakness: CWE-200

Description

filebrowser before 2.63.19 contains a permission bypass in the /api/resources endpoint. The checksum (?checksum=) branch of resourceGetHandler reads the entire file to compute a digest and returns it without performing a Perm.Download check (unlike the sibling raw, preview, and subtitle paths). As a result, an authenticated user provisioned with Perm.Download=false can obtain a content-hash oracle for any same-scope file (md5/sha1/sha256/sha512), enabling confirmation of known/guessed content, change detection, and offline brute-force of low-entropy files. This is an incomplete fix of CVE-2026-35606; it bypasses only the Download permission and does not defeat scope/path authorization.

Affected products

• filebrowser: before 2.63.19 — fixed in 2.63.19

How to fix

Upgrade to a fixed version: filebrowser 2.63.19. Check the vendor advisory for mitigations.

References

• https://github.com/filebrowser/filebrowser/commit/b7dc392838f11d188f0bc0f2a1a99fad3f7dca03
• https://github.com/filebrowser/filebrowser/security/advisories/GHSA-7whw-q6gh-xr59
• https://www.vulncheck.com/advisories/filebrowser-before-permission-bypass-via-checksum

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