What is CVE-2021-3376?

CVE-2021-3376 is a high-severity vulnerability in Cuppacms. CVSS score: 8.8/10. Published 2021-12-14.

How severe is CVE-2021-3376?

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

Vulnerability in Cuppacms

CVE-2021-3376

An issue was discovered in Cuppa CMS Versions Before 31 Jan 2021 allows authenticated attackers to gain escalated privileges via a crafted POST request using the user_group_id_field parameter.

Published 2021-12-14 · 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: 0.011 (64.4th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 64.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Cuppacms

References

github.com/CuppaCMS/CuppaCMS/issues/12 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2021-3376?: CVE-2021-3376 is a high-severity vulnerability in Cuppacms. CVSS score: 8.8/10. Published 2021-12-14.
How severe is CVE-2021-3376?: High severity. CVSS v3 base score is 8.8 out of 10.