How severe is CVE-2020-17451?

CVE-2020-17451 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2020-17451 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-17451?

CVE-2020-17451 affects Flatcore. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-17451?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-17451 published?

CVE-2020-17451 was published on 2020-08-09 and last updated on 2026-06-17.

CVE-2020-17451

CVE-2020-17451 is a medium-severity vulnerability in Flatcore with a CVSS 3.x base score of 4.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 4.8)
CVSS v2: 3.5
EPSS exploit prediction: 1% (45th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Flatcore
Published: 2020-08-09
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2020-17451?: 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.
How severe is CVE-2020-17451?: CVE-2020-17451 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2020-17451 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-17451?: CVE-2020-17451 affects Flatcore. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-17451?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-17451 published?: CVE-2020-17451 was published on 2020-08-09 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:flatcore:flatcore:*:*:*:*:*:*:*:*

More vulnerabilities in Flatcore

CVE-2019-13961 — High (CVSS 8.8): A CSRF vulnerability was found in flatCore before 1.5, leading to the upload of arbitrary .php files via…
CVE-2020-17452 — High (CVSS 7.2): flatCore before 1.5.7 allows upload and execution of a .php file by an admin.
CVE-2019-10652 — High (CVSS 7.2): An issue was discovered in flatCore 1.4.7. acp/acp.php allows remote authenticated administrators to upload arbitrary…
CVE-2021-23837 — Medium (CVSS 6.5): An issue was discovered in flatCore before 2.0.0 build 139. A time-based blind SQL injection was identified in the…
CVE-2017-9451 — Medium (CVSS 6.1): Cross site scripting (XSS) vulnerability in pages.edit_form.php in flatCore 1.4.6 allows remote attackers to inject…
CVE-2021-40555 — Medium (CVSS 5.4): Cross site scripting (XSS) vulnerability in flatCore-CMS 2.2.15 allows attackers to execute arbitrary code via…

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