What is CVE-2021-3983?

CVE-2021-3983 is a medium-severity vulnerability in Kevinpapst Kevinpapst/kimai2, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-12-01.

How severe is CVE-2021-3983?

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

XSS in Kevinpapst Kevinpapst/kimai2

CVE-2021-3983

kimai2 is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-12-01 · last modified 2026-06-17.

CVSS v3 metric

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

EPSS exploit prediction

EPSS: 0.008 (54.7th percentile), scored 2026-10-04.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 54.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: +0.000

Affected products

Kevinpapst Kevinpapst/kimai2 — versions unspecified
Kimai2 Project

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

huntr.dev/bounties/c96f3480-dccf-4cc2-99a4-d2b3a7462413 (Exploit, Patch, Third Party Advisory)
github.com/kevinpapst/kimai2/commit/89bfa82c61da0d3639e4038e689e25467baac8a0 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-3983?: CVE-2021-3983 is a medium-severity vulnerability in Kevinpapst Kevinpapst/kimai2, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-12-01.
How severe is CVE-2021-3983?: Medium severity. CVSS v3 base score is 6.1 out of 10.