What is CVE-2020-15276?

CVE-2020-15276 is a high-severity vulnerability in Basercms, classified under Cross-site Scripting. CVSS score: 7.7/10. Published 2020-10-30.

How severe is CVE-2020-15276?

High severity. CVSS v3 base score is 7.7 out of 10.

XSS in Basercms

CVE-2020-15276

baserCMS before version 4.4.1 is vulnerable to Cross-Site Scripting. Arbitrary JavaScript may be executed by entering a crafted nickname in blog comments. The issue affects the blog comment component. It is fixed in version 4.4.1.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2020-10-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.010 (61.4th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 61st percentile — 61.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Basercms
Baserproject Basercms — versions >= 4.0.0, < 4.4.1

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

basercms.net/security/20201029 (Vendor Advisory)
github.com/baserproject/basercms/security/advisories/GHSA-fw5q-j9p4-3vxg (Patch, Third Party Advisory)
github.com/baserproject/basercms/commit/d14f506385f21d67d5ff3462f204d4c2321b7c54 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2020-15276?: CVE-2020-15276 is a high-severity vulnerability in Basercms, classified under Cross-site Scripting. CVSS score: 7.7/10. Published 2020-10-30.
How severe is CVE-2020-15276?: High severity. CVSS v3 base score is 7.7 out of 10.