CVE-2021-41402Public exploitNetwork attack vector

Authenticated PHP execution via permalink cache injection

Published Jun 16, 2022 · Updated Aug 4, 2024

Code injection in flatCore-CMS 2.0.8 allows remote authenticated users to execute arbitrary PHP code through a crafted page permalink. The administrative page editor writes the unsanitized Permalink value into active_urls.php and cache_lastedit.php, which PHP evaluates when the homepage loads. Administration-backend access and permission to create a page are required; successful exploitation runs supplied PHP with the web server's privileges.

CVSS severity8.8
High
EPSS probability1.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in flatCore-CMS 2.0.8 allows remote authenticated users to execute arbitrary PHP code through a crafted page permalink. The administrative page editor writes the unsanitized Permalink value into active_urls.php and cache_lastedit.php, which PHP evaluates when the homepage loads. Administration-backend access and permission to create a page are required; successful exploitation runs supplied PHP with the web server's privileges.

The record

CVE
CVE-2021-41402
Published
Jun 16, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-94, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 16, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:P

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1059Command and Scripting Interpreter

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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