What is CVE-2026-28674?

CVE-2026-28674 is a high-severity vulnerability in Danvei233 Xiaoheifs, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 7.2/10. Published 2026-03-18.

How severe is CVE-2026-28674?

High severity. CVSS v3 base score is 7.2 out of 10.

Arbitrary file upload in Danvei233 Xiaoheifs

CVE-2026-28674

xiaoheiFS is a self-hosted financial and operational system for cloud service businesses. In versions up to and including 0.3.15, the `AdminPaymentPluginUpload` endpoint lets admins upload any file to `plugins/payment/`. It only checks a hardcoded password (`qweasd123456`) and ignores file content. A background watcher (`StartWatcher`) then scans this folder every 5 seconds. If it finds a new executable, it runs it immediately, resulting in RCE. Version 4.0.0 fixes the issue.

Vulnerability class: Unrestricted File Upload

Published 2026-03-18 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.005 (39.7th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 39.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.001

Affected products

Danvei233 Xiaoheifs — versions < 0.4.0

Weakness classification (CWE)

References

github.com/danvei233/xiaoheiFS/security/advisories/GHSA-hcj4-gfvq-qv4p (Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-28674?: CVE-2026-28674 is a high-severity vulnerability in Danvei233 Xiaoheifs, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 7.2/10. Published 2026-03-18.
How severe is CVE-2026-28674?: High severity. CVSS v3 base score is 7.2 out of 10.