CVE-2021-23838

MediumCVSS 4.8/10Last modified Jun 17, 2026

Description

An issue was discovered in flatCore before 2.0.0 build 139. A reflected XSS vulnerability was identified in the media_filter HTTP request body parameter for the acp interface. The affected parameter accepts malicious client-side script without proper input sanitization. For example, a malicious user can leverage this vulnerability to steal cookies from a victim user and perform a session-hijacking attack, which may then lead to unauthorized access to the site.

Metrics

CVSS 3.1 4.8/10CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Weakness enumeration

CWE-79

Affected software

Vendor	Product	Versions
n/a	n/a	n/a

References

http://packetstormsecurity.com/files/160936/flatCore-CMS-XSS-File-Disclosure-SQL-Injection.htmlExploit, Third Party Advisory, VDB Entry
https://github.com/flatCore/flatCore-CMSProduct, Third Party Advisory
https://sec-consult.com/vulnerability-lab/Third Party Advisory
http://packetstormsecurity.com/files/160936/flatCore-CMS-XSS-File-Disclosure-SQL-Injection.htmlExploit, Third Party Advisory, VDB Entry
https://github.com/flatCore/flatCore-CMSProduct, Third Party Advisory
https://sec-consult.com/vulnerability-lab/Third Party Advisory

Timeline

Published: Jan 15, 2021
Last modified: Jun 17, 2026
NVD status: Modified

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