What is CVE-2020-21333?

CVE-2020-21333 is a medium-severity vulnerability in Publiccms, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2021-07-09.

How severe is CVE-2020-21333?

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

XSS in Publiccms

CVE-2020-21333

Cross Site Scripting (XSS) vulnerability in PublicCMS 4.0 to get an admin cookie when the Administrator reviews submit case.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-07-09 · last modified 2026-06-17.

CVSS v3 metric

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

EPSS exploit prediction

EPSS: 0.005 (38.6th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 38.6% 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

Publiccms — versions 4.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/sanluan/PublicCMS/issues/27 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2020-21333?: CVE-2020-21333 is a medium-severity vulnerability in Publiccms, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2021-07-09.
How severe is CVE-2020-21333?: Medium severity. CVSS v3 base score is 5.4 out of 10.