What is CVE-2023-36816?

CVE-2023-36816 is a medium-severity vulnerability in 2fauth, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2023-07-03.

How severe is CVE-2023-36816?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in 2fauth

CVE-2023-36816

2FA is a Web app to manage Two-Factor Authentication (2FA) accounts and generate their security codes. Cross site scripting (XSS) injection can be done via the account/service field. This was tested in docker-compose environment. This vulnerability has been patched in version 4.0.3.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2023-07-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H.

EPSS exploit prediction

EPSS: 0.005 (40.2th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 40.2% 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

2fauth
Bubka 2fauth — versions < 4.0.3

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/Bubka/2FAuth/security/advisories/GHSA-cwhq-2mcq-pp9q (Exploit, Vendor Advisory)
github.com/Bubka/2FAuth/releases/tag/v4.0.3 (Release Notes)

Frequently asked questions

What is CVE-2023-36816?: CVE-2023-36816 is a medium-severity vulnerability in 2fauth, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2023-07-03.
How severe is CVE-2023-36816?: Medium severity. CVSS v3 base score is 6.1 out of 10.