Arbitrary file upload in Riganti Dotvvm

CVE-2026-57581

DotVVM is an open source MVVM framework for web applications. Prior to 4.2.11, 4.3.15, and 5.0.0-preview09-final, applications with configured file upload storage allow unauthenticated users to submit files directly to DotvvmFileUploadMiddleware without an X-DotVVM-UploadToken generated by the FileUpload component. An attacker can repeatedly upload files and fill application storage, causing denial of service. DotvvmConfiguration.Security.AuthorizeFileUpload can additionally restrict which users may upload files. This issue is fixed in versions 4.2.11, 4.3.15, and 5.0.0-preview09-final.

Vulnerability class: Unrestricted File Upload

Published · last modified .

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.006 (48.3th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 48.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-57581: held from 0.006 to 0.006.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

  • Riganti Dotvvm — versions < 4.2.11, >= 4.3.0, < 4.3.15, >= 5.0.0-preview01, < 5.0.0-preview09-final

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-57581?
CVE-2026-57581 is a medium-severity vulnerability in Riganti Dotvvm, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 5.3/10. Published 2026-09-14.
How severe is CVE-2026-57581?
Medium severity. CVSS v3 base score is 5.3 out of 10.