What is CVE-2023-3491?

CVE-2023-3491 is a high-severity vulnerability in Fossbilling, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 8.8/10. Published 2023-06-30.

How severe is CVE-2023-3491?

High severity. CVSS v3 base score is 8.8 out of 10.

Arbitrary file upload in Fossbilling

CVE-2023-3491

Unrestricted Upload of File with Dangerous Type in GitHub repository fossbilling/fossbilling prior to 0.5.3.

Vulnerability class: Unrestricted File Upload

Published 2023-06-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.009 (57.8th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 57.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Fossbilling
Fossbilling Fossbilling/fossbilling — versions unspecified

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

References

huntr.dev/bounties/043bd900-ac78-44d2-a340-84ddd0bc4a1d (Exploit, Patch, Third Party Advisory)
github.com/fossbilling/fossbilling/commit/2ddb7438ee0d05f9a9d01555edcfed820960f… (Patch)

Frequently asked questions

What is CVE-2023-3491?: CVE-2023-3491 is a high-severity vulnerability in Fossbilling, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 8.8/10. Published 2023-06-30.
How severe is CVE-2023-3491?: High severity. CVSS v3 base score is 8.8 out of 10.