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filebrowser CVE-2026-72834

| EUVDEUVD-2026-58648 MEDIUM
Information Exposure (CWE-200)
2026-08-14 VulnCheck GHSA-vmph-pw37-x65f
Information Disclosure Oracle Filebrowser
5.3
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
5.3 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
4.3 MEDIUM

Network-accessible API requiring authenticated session (PR:L); no scope change; only partial confidentiality impact (hash, not plaintext content).

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

2
Source Code Evidence Fetched
Aug 14, 2026 - 12:35 vuln.today
Analysis Generated
Aug 14, 2026 - 12:35 vuln.today

DescriptionCVE.org

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.

AnalysisAI

Authenticated users with Perm.Download=false can extract cryptographic content hashes (MD5, SHA1, SHA256, SHA512) for any file within their scope via filebrowser's /api/resources?checksum= endpoint, bypassing the intended download permission gate. The resourceGetHandler's checksum branch reads entire file content to compute digests but omits the Perm.Download check enforced by all sibling handler paths (raw, preview, subtitle). …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate with restricted filebrowser account
Delivery
Identify target file path within scope
Exploit
Send GET /api/resources/<path>?checksum=sha256
Execution
Receive hash without download permission check
Persist
Compare hash against candidate dictionary
Impact
Confirm or brute-force file content offline
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Vulnerability AssessmentAI

Exploitation Exploitation requires an authenticated filebrowser session (CVSS PR:L confirmed); unauthenticated access is not possible. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N) scores 5.3 and accurately characterizes the risk: network-reachable, low complexity, but gated behind authenticated access (PR:L), with only partial confidentiality exposure (VC:L - hashes, not plaintext). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An authenticated filebrowser user whose account has Perm.Download explicitly set to false (e.g., a read-audit account or a restricted contractor) sends a GET request to /api/resources/path/to/sensitive.conf?checksum=sha256 - the server reads the full file, computes the SHA256 digest, and returns it in the response without triggering the download permission check. The attacker then compares the returned hash against a precomputed dictionary of candidate configuration values (e.g., known API key formats, default passwords) to confirm or deny the file's exact content, or polls the endpoint periodically to detect when the file changes. …
Remediation Upgrade filebrowser to version 2.63.19 or later, which adds the missing Perm.Download check to the checksum branch of resourceGetHandler; the upstream patch is at https://github.com/filebrowser/filebrowser/commit/b7dc392838f11d188f0bc0f2a1a99fad3f7dca03 and the security advisory is at https://github.com/filebrowser/filebrowser/security/advisories/GHSA-7whw-q6gh-xr59. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-72834 vulnerability details – vuln.today
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