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CVE-2023-28819

15
FAUCET Score

CVE-2023-28819 is a Stored Cross-Site Scripting (XSS) vulnerability affecting Concrete CMS versions 8.5.12 and below, and 9.0.0 through 9.0.2, where malicious scripts can be embedded within uploaded file and folder names. Rated as Medium severity with a CVSS score of 5.4, this vulnerability requires low privileges and user interaction, potentially leading to limited impact on confidentiality and integrity. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 9.1.0CPE matchmatch criteria
cpe:2.3:a:concretecms:concrete_cms:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

3.5LOW

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
0.9
Impact Score
2.5
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.64%
Probability of exploitation in next 30 days
EPSS Percentile
47.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0064 is in the 79th percentile among its peer group of 15,239 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

composerpatch availablevia ghsa
Product: concrete5/concrete5Fixed in: 9.1.0

Vendor Advisories (1)

composerGHSA-474f-mcjv-pgrmlow

Concrete CMS (previously concrete5) is vulnerable to stored XSS in uploaded file and folder names

Apr 28, 2023

References

github.com / concretecms/concretecms/releases
Release Notes
concretecms.org / about/project-news/security/2023-11-09-security-blog-about-updated-cves-and-new-release
concretecms.org / about/project-news/security/concrete-cms-security-advisory-2023-04-20
Vendor Advisory