CVE-2020-17451

Name: CVE-2020-17451
Creator: NVD / NIST
Published: 2020-08-09T19:15:11.953+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.8/10EPSS 0.61%

Last modified Jun 17, 2026

CVE-2020-17451 is a medium-severity vulnerability rated 4.8/10 on the CVSS scale. flatCore before 1.5.7 allows XSS by an admin via the acp/acp.php?tn=pages&sub=edit&editpage=1 page_linkname, page_title, page_content, or page_extracontent parameter, or the acp/acp.php?tn=system&sub=sys_pref prefs_pagename, prefs_pagetitle, or prefs_pagesubtitle parameter.. EPSS estimates a 0.61% chance of exploitation in the next 30 days.

Description

flatCore before 1.5.7 allows XSS by an admin via the acp/acp.php?tn=pages&sub=edit&editpage=1 page_linkname, page_title, page_content, or page_extracontent parameter, or the acp/acp.php?tn=system&sub=sys_pref prefs_pagename, prefs_pagetitle, or prefs_pagesubtitle parameter.

Metrics

CVSS 3.1

4.8/10

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

EPSS Probability

0.61%

44.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Flatcore	Flatcore	< 1.5.7

References

https://lists.openwall.net/full-disclosure/2020/08/07/1Exploit, Mailing List, Third Party Advisory
https://sec-consult.com/en/blog/advisories/multiple-vulnerabilities-in-flatcore-cms/Exploit, Third Party Advisory
https://lists.openwall.net/full-disclosure/2020/08/07/1Exploit, Mailing List, Third Party Advisory
https://sec-consult.com/en/blog/advisories/multiple-vulnerabilities-in-flatcore-cms/Exploit, Third Party Advisory

Timeline

Published: Aug 9, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-17451?

How severe is CVE-2020-17451?

CVE-2020-17451 has a CVSS score of 4.8/10 (MEDIUM severity). The EPSS model estimates a 0.61% probability of exploitation in the next 30 days.

How do I fix CVE-2020-17451?

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-2020-17451?

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

Scan your code now

Source: NVD / NIST