What is CVE-2016-11020?

CVE-2016-11020 is a critical-severity vulnerability in Kunena, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2020-02-25.

How severe is CVE-2016-11020?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Arbitrary file upload in Kunena

CVE-2016-11020

Kunena before 5.0.4 does not restrict avatar file extensions to gif, jpeg, jpg, and png. This can lead to XSS and remote code execution.

Vulnerability class: Unrestricted File Upload

Published 2020-02-25 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.029 (86.3th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 86th percentile — 86.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.029 · newest: 0.029 · change: 0.000

Affected products

Kunena

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

References

www.kunena.org/bugs/changelog (Release Notes, Vendor Advisory)
github.com/Kunena/Kunena-Forum/pull/5028 (Patch, Third Party Advisory)
www.kunena.org/blog/179-kunena-5-0-4-released (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2016-11020?: CVE-2016-11020 is a critical-severity vulnerability in Kunena, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2020-02-25.
How severe is CVE-2016-11020?: Critical severity. CVSS v3 base score is 9.8 out of 10.