What is CVE-2023-28477?

CVE-2023-28477 is a medium-severity vulnerability in Concretecms Concrete Cms, classified under Cross-site Scripting. CVSS score: 5.5/10. Published 2023-04-28.

How severe is CVE-2023-28477?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Is CVE-2023-28477 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Concretecms Concrete Cms

CVE-2023-28477

Concrete CMS (previously concrete5) versions 8.5.12 and below, and 9.0 through 9.1.3 is vulnerable to stored XSS on API Integrations via the name parameter.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2023-04-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:L/A:N.

EPSS exploit prediction

EPSS: 0.006 (45.8th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 45.8% 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

Concretecms Concrete Cms

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

Frequently asked questions

What is CVE-2023-28477?: CVE-2023-28477 is a medium-severity vulnerability in Concretecms Concrete Cms, classified under Cross-site Scripting. CVSS score: 5.5/10. Published 2023-04-28.
How severe is CVE-2023-28477?: Medium severity. CVSS v3 base score is 5.5 out of 10.
Is CVE-2023-28477 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.