flatCore before 1.5.7 allows upload and execution of a .php file by an admin.

published 2020-08-09 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-9404

cvss: 7.2; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 2.4%; EPSS 2.4% chance of exploitation in 30 days, percentile 84%
public exploits: 0; none known

Patch / fix

fixed in 1

flatcore flatcore 1.5.7

Exploit prediction

2.43% chance of exploitation in the next 30 days, higher than 84% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

lists.openwall.net https://lists.openwall.net/full-disclosure/2020/08/07/1 referenced PoC, tagged "exploit" by a source, unverified
sec-consult.com https://sec-consult.com/en/blog/advisories/multiple-vulnerabilities-in-flatcore-cms/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	7.2	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	9.0	AV:N/AC:L/Au:S/C:C/I:C/A:C

Classification

Weakness

CWE-434 Unrestricted Upload of File with Dangerous Type

References

lists.openwall.net /full-disclosure/2020/08/07/1
exploit, mailing-list, third-party-advisory
sec-consult.com /en/blog/advisories/multiple-vulnerabilities-in-flatcore-cms/
exploit, third-party-advisory

Sources

CVE List CVE-2020-17452
NVD CVE-2020-17452

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary