EUVD-2026-58652
GHSA-4fmc-f52r-93hm
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/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
Network-accessible endpoint exploitable by any authenticated low-privilege user (PR:L), no scope change, causing full availability impact via disk exhaustion with no C or I consequence.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/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
3DescriptionCVE.org
FileBrowser versions before 2.63.19 fail to enforce the declared Upload-Length in the TUS resumable-upload PATCH endpoint, allowing authenticated users to write arbitrary data to disk. Attackers can send oversized request bodies that exceed the declared upload length to exhaust available disk space and cause service unavailability.
AnalysisAI
FileBrowser versions before 2.63.19 fail to enforce the TUS Upload-Length boundary in the PATCH resumable-upload endpoint, enabling authenticated users to stream arbitrarily large request bodies directly to disk regardless of the length declared at upload creation. The root cause, confirmed by the patch diff, is an unbounded io.Copy call that passed r.Body directly to the target file without capping reads to the remaining declared bytes. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid authenticated FileBrowser user account at any privilege level - the CVSS PR:L metric confirms low-privilege authentication is sufficient and 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:N/VI:N/VA:H/SC:N/SI:N/SA:N) yielding a score of 7.1 accurately characterizes this vulnerability: network-accessible, low-complexity exploitation by an authenticated user causing high availability impact with no confidentiality or integrity consequences. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade FileBrowser to version 2.63.19 or later, which enforces the TUS Upload-Length constraint by capping disk writes with io.LimitReader and rolling back partial writes that exceed the declared length. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, audit all FileBrowser deployments to identify instances running versions before 2.63.19 and prioritize them for remediation. …
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External POC / Exploit Code
Leaving vuln.today