EUVD-2026-19782
GHSA-7526-j432-6ppp
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
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, the fix in commit b6a4fb1 ("self-registered users don't get execute perms") stripped Execute permission and Commands from users created via the signup handler. The same fix was not applied to the proxy auth handler. Users auto-created on first successful proxy-auth login are granted execution capabilities from global defaults, even though the signup path was explicitly changed to prevent execution rights from being inherited by automatically provisioned accounts. This vulnerability is fixed in 2.63.1.
AnalysisAI
Auto-provisioned users in File Browser's proxy authentication flow inherit elevated execution permissions that were explicitly blocked in the self-registration flow, enabling unauthorized command execution. Versions prior to 2.63.1 grant execute capabilities to proxy-auth users from global defaults, bypassing security controls added in commit b6a4fb1. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | File Browser versions prior to 2.63.1 with proxy authentication enabled. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This vulnerability presents moderate-to-high real-world risk despite the CVSS 8.1 rating, contingent on deployment architecture. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker identifies a File Browser instance using proxy authentication with a permissive upstream authentication system or compromised proxy credentials. After successfully authenticating through the proxy layer (potentially via credential stuffing, session hijacking, or exploiting weaknesses in the proxy's authentication logic), the attacker's first login triggers automatic account creation in File Browser. … |
| Remediation | Upgrade File Browser to version 2.63.1 or later, which applies consistent permission stripping across both signup and proxy authentication handlers. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all File Browser deployments and identify those using proxy authentication for user provisioning. …
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