What is CVE-2021-47931?

CVE-2021-47931 is a medium-severity vulnerability in Exponentcms Exponent Cms, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2026-05-10.

How severe is CVE-2021-47931?

Medium severity. CVSS v3 base score is 6.4 out of 10.

XSS in Exponentcms Exponent Cms

CVE-2021-47931

Exponent CMS 2.6 contains a stored cross-site scripting vulnerability that allows authenticated attackers to inject malicious scripts through the Title and Text Block parameters in the text editing endpoint. Attackers can inject iframe pay…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.001 (21.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.

Affected products

Exponentcms Exponent Cms — versions 0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

disclosure@vulncheck.com (exploit)
disclosure@vulncheck.com (product)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2021-47931?: CVE-2021-47931 is a medium-severity vulnerability in Exponentcms Exponent Cms, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2026-05-10.
How severe is CVE-2021-47931?: Medium severity. CVSS v3 base score is 6.4 out of 10.