What is CVE-2020-15155?

CVE-2020-15155 is a high-severity vulnerability in Basercms, classified under Cross-site Scripting. CVSS score: 7.3/10. Published 2020-08-28.

How severe is CVE-2020-15155?

High severity. CVSS v3 base score is 7.3 out of 10.

XSS in Basercms

CVE-2020-15155

baserCMS 4.3.6 and earlier is affected by Cross Site Scripting (XSS) via arbitrary script execution. Admin access is required to exploit this vulnerability. The affected components is toolbar.php. The issue is fixed in version 4.3.7.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2020-08-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.013 (69.0th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 69.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

Basercms
Baserproject Basercms — versions unspecified

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

basercms.net/security/20200827 (Vendor Advisory)
github.com/baserproject/basercms/security/advisories/GHSA-4r3m-j6x5-48m3 (Patch, Third Party Advisory)
github.com/baserproject/basercms/commit/94cbfab74c9fd6d04492597a1a684674c3c0e30f (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2020-15155?: CVE-2020-15155 is a high-severity vulnerability in Basercms, classified under Cross-site Scripting. CVSS score: 7.3/10. Published 2020-08-28.
How severe is CVE-2020-15155?: High severity. CVSS v3 base score is 7.3 out of 10.