How severe is CVE-2018-20062?

CVE-2018-20062 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-20062 being actively exploited?

Yes. CVE-2018-20062 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2021-11-03, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2018-20062?

CVE-2018-20062 affects 5none Nonecms. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-20062?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2018-20062 have an EU (EUVD) identifier?

Yes. CVE-2018-20062 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2018-12637. It is also flagged as exploited in the EUVD (since 2021-11-03).

When was CVE-2018-20062 published?

CVE-2018-20062 was published on 2018-12-11 and last updated on 2026-06-17.

CVE-2018-20062

CVE-2018-20062 is a critical-severity vulnerability in 5none Nonecms with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2021-11-03).

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 100% (100th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2021-11-03)
EU (EUVD) id: EUVD-2018-12637
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2021-11-03)
Affected product: 5none Nonecms
Published: 2018-12-11
Last modified: 2026-06-17

Description

An issue was discovered in NoneCms V1.3. thinkphp/library/think/App.php allows remote attackers to execute arbitrary PHP code via crafted use of the filter parameter, as demonstrated by the s=index/\think\Request/input&filter=phpinfo&data=1 query string.

Frequently asked questions

What is CVE-2018-20062?: An issue was discovered in NoneCms V1.3. thinkphp/library/think/App.php allows remote attackers to execute arbitrary PHP code via crafted use of the filter parameter, as demonstrated by the s=index/\think\Request/input&filter=phpinfo&data=1 query string.
How severe is CVE-2018-20062?: CVE-2018-20062 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-20062 being actively exploited?: Yes. CVE-2018-20062 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2021-11-03, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2018-20062?: CVE-2018-20062 affects 5none Nonecms. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-20062?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2018-20062 have an EU (EUVD) identifier?: Yes. CVE-2018-20062 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2018-12637. It is also flagged as exploited in the EUVD (since 2021-11-03).
When was CVE-2018-20062 published?: CVE-2018-20062 was published on 2018-12-11 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:5none:nonecms:1.3.0:*:*:*:*:*:*:*

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