What is CVE-2023-3394?

CVE-2023-3394 is a medium-severity vulnerability in Fossbilling, classified under Session Fixation. CVSS score: 5.4/10. Published 2023-06-23.

How severe is CVE-2023-3394?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Vulnerability in Fossbilling

CVE-2023-3394

Session Fixation in GitHub repository fossbilling/fossbilling prior to 0.5.1.

Published 2023-06-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.005 (40.8th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 40.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Fossbilling
Fossbilling Fossbilling/fossbilling — versions unspecified

Weakness classification (CWE)

CWE-384 — Session Fixation

References

huntr.dev/bounties/84bf3e85-cdeb-4b8d-9ea4-74156dbda83f (Exploit, Patch, Third Party Advisory)
github.com/fossbilling/fossbilling/commit/b9c35a174750f1463aea86168524efce6cd48… (Patch)

Frequently asked questions

What is CVE-2023-3394?: CVE-2023-3394 is a medium-severity vulnerability in Fossbilling, classified under Session Fixation. CVSS score: 5.4/10. Published 2023-06-23.
How severe is CVE-2023-3394?: Medium severity. CVSS v3 base score is 5.4 out of 10.