Filebrowser up to 2.63.18 Checksum /api/resources resourceGetHandler checksum privileges management

Summaryinfo

A vulnerability was found in Filebrowser up to 2.63.18. It has been classified as problematic. This impacts the function resourceGetHandler of the file /api/resources of the component Checksum Handler. Performing a manipulation of the argument checksum results in privileges management. This vulnerability was named CVE-2026-72834. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in Filebrowser up to 2.63.18. It has been classified as problematic. This affects the function resourceGetHandler of the file /api/resources of the component Checksum Handler. The manipulation of the argument checksum with an unknown input leads to a privileges management vulnerability. CWE is classifying the issue as CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. This is going to have an impact on confidentiality. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-72834 since 08/10/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

Upgrading to version 2.63.19 eliminates this vulnerability.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Name

• Filebrowser

Version

• 2.63.0
• 2.63.1
• 2.63.2
• 2.63.3
• 2.63.4
• 2.63.5
• 2.63.6
• 2.63.7
• 2.63.8
• 2.63.9
• 2.63.10
• 2.63.11
• 2.63.12
• 2.63.13
• 2.63.14
• 2.63.15
• 2.63.16
• 2.63.17
• 2.63.18

Website

• Product: https://github.com/filebrowser/filebrowser/

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion