What is CVE-2020-21246?

CVE-2020-21246 is a medium-severity vulnerability in Yiicms Project, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2023-06-20.

How severe is CVE-2020-21246?

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

XSS in Yiicms Project

CVE-2020-21246

Cross Site Scripting vulnerability in YiiCMS v.1.0 allows a remote attacker to execute arbitrary code via the news function.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2023-06-20 · 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: 0.006 (44.2th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 44.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Yiicms Project — versions 1.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/yongshengli/yiicms/issues/6 (Exploit, Patch, Issue Tracking)

Frequently asked questions

What is CVE-2020-21246?: CVE-2020-21246 is a medium-severity vulnerability in Yiicms Project, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2023-06-20.
How severe is CVE-2020-21246?: Medium severity. CVSS v3 base score is 5.4 out of 10.