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Vulnerability record · CVE-2021-3745 · published 28 October 2021

CVE-2021-3745: Flatcore-cms unrestricted file upload vulnerability

Flatcore · Flatcore Cms

flatcore-cms is vulnerable to Unrestricted Upload of File with Dangerous Type

6.6 CVSS 3.1 Medium EPSS 1.1% · top 35.4% CWE-434 · Unrestricted file upload
6.6CVSS 3.1 base score, v2 6.0
1.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

flatcore-cms is vulnerable to Unrestricted Upload of File with Dangerous Type

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/flatcore/flatcore-cms/commit/5cc3937b6bc38293ec921a5cf00018b48b668dc6 PatchThird Party Advisory
https://huntr.dev/bounties/7879ab3d-8018-402a-aa0b-131bdbd1966c ExploitIssue TrackingPatchThird Party Advisory
https://github.com/flatcore/flatcore-cms/commit/5cc3937b6bc38293ec921a5cf00018b48b668dc6 PatchThird Party Advisory
https://huntr.dev/bounties/7879ab3d-8018-402a-aa0b-131bdbd1966c ExploitIssue TrackingPatchThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2021-41403Flatcore-cms server-side request forgery (ssrf) vulnerabilityflatCore-CMS version 2.0.8 calls dangerous functions, causing server-side request forgery vulnerabilities.EPSS 19%9.8CVE-2017-7878Flatcore-cms sql injection vulnerabilitySQL Injection vulnerability in flatCore version 1.4.6 allows an attacker to read and write to the users database.EPSS 1.0%8.8CVE-2021-41402Flatcore-cms code injection vulnerabilityflatCore-CMS v2.0.8 has a code execution vulnerability, which could let a remote malicious user execute arbitrary PHP code.EPSS 1.4%8.8CVE-2017-7877Flatcore-cms cross-site request forgery vulnerabilityCSRF vulnerability in flatCore version 1.4.6 allows remote attackers to modify CMS configurations.EPSS 0.91%7.5CVE-2017-8868Flatcore-cms path traversal vulnerabilityacp/core/files.browser.php in flatCore 1.4.7 allows file deletion via directory traversal in the delete parameter to acp/acp.php. The risk might be l…EPSS 1.9%7.5CVE-2017-7879Flatcore-cms sql injection vulnerabilitySQL Injection vulnerability in flatCore version 1.4.6 allows an attacker to read the content database.EPSS 1.0%7.2CVE-2021-39608FlatCore-CMS upload addon allows unrestricted PHP file upload and RCEFlatCore-CMS 2.0.7 contains an unrestricted file upload flaw (CWE-434) in the upload addon plugin, letting a remote user place arbitrary PHP code on …EPSS 46%analysed6.1CVE-2022-43118Flatcore-cms cross-site scripting vulnerabilityA cross-site scripting (XSS) vulnerability in flatCore-CMS v2.1.0 allows attackers to execute arbitrary web scripts or HTML via a crafted payload inj…EPSS 0.43%

Source: NIST National Vulnerability Database (record CVE-2021-3745), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.