CVE-2021-23838

MEDIUM
4.8
CVSS Score
Published: January 15, 2021 at 06:27 AM UTC
Updated: June 17, 2026 at 03:38 AM UTC
1 product affected across 1 vendorFlatcore

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Severity
MEDIUM4.8
Exploit prediction
EPSS 1.0%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v ≤ 2.0.0

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (3)

x_refsource_MISCProductThird Party Advisory
https://github.com/flatCore/flatCore-CMS
x_refsource_MISCThird Party Advisory
https://sec-consult.com/vulnerability-lab/

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
HIGH
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-79

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