CVE-2021-23835

Name: CVE-2021-23835
Creator: NVD / NIST
Published: 2021-01-15T07:15:13.97+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.9/10EPSS 1.68%

Last modified Jun 17, 2026

CVE-2021-23835 is a medium-severity vulnerability rated 4.9/10 on the CVSS scale. An issue was discovered in flatCore before 2.0.0 build 139. A local file disclosure vulnerability was identified in the docs_file HTTP request body parameter for the acp interface. EPSS estimates a 1.68% chance of exploitation in the next 30 days.

Description

An issue was discovered in flatCore before 2.0.0 build 139. A local file disclosure vulnerability was identified in the docs_file HTTP request body parameter for the acp interface. This can be exploited with admin access rights. The affected parameter (which retrieves the contents of the specified file) was found to be accepting malicious user input without proper sanitization, thus leading to retrieval of backend server sensitive files, e.g., /etc/passwd, SQLite database files, PHP source code, etc.

Metrics

CVSS 3.1

4.9/10

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

EPSS Probability

1.68%

74.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
Flatcore	Flatcore	<= 2.0.0

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
Status: Modified

Frequently Asked Questions

What is CVE-2021-23835?

How severe is CVE-2021-23835?

CVE-2021-23835 has a CVSS score of 4.9/10 (MEDIUM severity). The EPSS model estimates a 1.68% probability of exploitation in the next 30 days.

How do I fix CVE-2021-23835?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-23835?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST