CVE-2021-23835Public exploitNetwork attack vector

Administrator file disclosure via unsanitized docs_file path

Published Jan 15, 2021 · Updated Aug 3, 2024

Path traversal in flatCore CMS before 2.0.0 build 139 allows remote authenticated users to read server files through the acp interface. The help module passes the unsanitized docs_file POST value to file-content retrieval, so ../ sequences escape the intended path. Administrative access is required; successful exploitation exposes readable system files, SQLite databases, and PHP source code.

CVSS severity4.9
Medium
EPSS probability1.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in flatCore CMS before 2.0.0 build 139 allows remote authenticated users to read server files through the acp interface. The help module passes the unsanitized docs_file POST value to file-content retrieval, so ../ sequences escape the intended path. Administrative access is required; successful exploitation exposes readable system files, SQLite databases, and PHP source code.

The record

CVE
CVE-2021-23835
Published
Jan 15, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-20, T1005
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jan 15, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.0NIST NVDAV:N/AC:L/Au:S/C:P/I:N/A:N
4.9NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-20Improper Input Validation
T1005Data from Local System

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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