EUVD-2026-19776
GHSA-v9w4-gm2x-6rvf
Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/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
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/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
Lifecycle Timeline
5DescriptionGitHub Advisory
File Browser is a file managing interface for uploading, deleting, previewing, renaming, and editing files within a specified directory. Prior to 2.63.1, when an admin revokes a user's Share and Download permissions, existing share links created by that user remain fully accessible to unauthenticated users. The public share download handler does not re-check the share owner's current permissions. This vulnerability is fixed in 2.63.1.
AnalysisAI
Authorization bypass in File Browser allows unauthenticated access to shared files after permissions revoked. When administrators revoke a user's Share and Download permissions in File Browser (versions prior to 2.63.1), previously created share links remain accessible to unauthenticated users due to missing permission re-validation in the public share handler. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | File Browser versions prior to 2.63.1. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Real-world risk is moderate despite the 8.2 CVSS score. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An administrator revokes Share and Download permissions for a departing contractor who previously created public share links to sensitive project documentation stored in File Browser. Despite the permission revocation appearing successful in the admin interface, the contractor retains the share URLs in their browser history or documentation. … |
| Remediation | Upgrade File Browser to version 2.63.1 or later, which contains the authorization fix addressing improper permission validation in the public share handler. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all File Browser instances in your environment and document current versions; disable or audit all active share links pending security review. …
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