Vulnerability in Filebrowser
CVE-2026-82238
filebrowser from version 2.24.0 contains a race condition in the TUS upload handler that allows authenticated users to write past the declared Upload-Length by sending concurrent PATCH requests. Attackers can send multiple simultaneous PATCH requests at the same offset to bypass length validation, resulting in files that exceed their declared size and triggering completion hooks for oversized uploads.
Vulnerability class: TOCTOU (Time-of-Check to Time-of-Use)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.1 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.002 (10.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 10th percentile — 10.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
Weakness classification (CWE)
References
- github.com/filebrowser/filebrowser/security/advisories/GHSA-4r8p-gqj2-mwgm (vendor-advisory)
- www.vulncheck.com/advisories/filebrowser-2.24.0-race-condition-via-tus-concurre… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-82238?
- CVE-2026-82238 is a low-severity vulnerability in Filebrowser, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 3.1/10. Published 2026-08-28.
- How severe is CVE-2026-82238?
- Low severity. CVSS v3 base score is 3.1 out of 10.