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

Quick assessment

Affected
filebrowser filebrowser
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

File Browser是File Browser组织的一款文件浏览管理软件。 File Browser 2.63.19之前版本存在信息泄露漏洞，该漏洞源于/api/resources端点未执行Perm.Download检查，可能导致已认证用户获取文件内容哈希，进而确认文件内容、检测文件变化及对低熵文件进行离线暴力破解。

CVSS 4.3 · Medium EPSS 0.39% · P31

Affected Version Matrix 2

VendorProduct Version RangeStatus
filebrowser filebrowser < 2.63.19 affected
2.63.19 unaffected
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I. Basic Information for CVE-2026-72834

Vulnerability Information
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Vulnerability Title
filebrowser before 2.63.19 Permission Bypass via checksum
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
File Browser 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
File Browser是File Browser组织的一款文件浏览管理软件。 File Browser 2.63.19之前版本存在信息泄露漏洞，该漏洞源于/api/resources端点未执行Perm.Download检查，可能导致已认证用户获取文件内容哈希，进而确认文件内容、检测文件变化及对低熵文件进行离线暴力破解。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
filebrowser filebrowser 0 ~ 2.63.19 -

II. Public POCs for CVE-2026-72834

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III. Intelligence Information for CVE-2026-72834

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Patches & Fixes for CVE-2026-72834 (1)

Vendor Advisories for CVE-2026-72834 (2)

Same Patch Batch · filebrowser · 2026-08-14 · 5 CVEs total

CVE-2026-72837 8.8 HIGH File Browser before 2.63.20 Privilege Escalation via Proxy Authentication
CVE-2026-72836 8.1 HIGH FileBrowser before 2.63.19 Case Sensitivity Authentication Bypass
CVE-2026-72835 6.8 MEDIUM filebrowser before v2.63.21 Access Rule Bypass via Path Canonicalization
CVE-2026-72838 6.5 MEDIUM FileBrowser before 2.63.19 Disk Exhaustion via TUS Upload

IV. Related Vulnerabilities

Same product: filebrowser
Same vendor: filebrowser
Same weakness: CWE-200

V. Comments for CVE-2026-72834

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