How severe is CVE-2021-40189?

CVE-2021-40189 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-40189 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-40189?

CVE-2021-40189 affects Php-fusion Phpfusion. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-40189?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-40189 published?

CVE-2021-40189 was published on 2021-10-11 and last updated on 2026-06-17.

CVE-2021-40189

CVE-2021-40189 is a high-severity vulnerability in Php-fusion Phpfusion with a CVSS 3.x base score of 7.2. 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-434.

Key facts

Severity: High (CVSS 3.x base score 7.2)
CVSS v2: 6.5
EPSS exploit prediction: 2% (75th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-434
Affected product: Php-fusion Phpfusion
Published: 2021-10-11
Last modified: 2026-06-17

Description

PHPFusion 9.03.110 is affected by a remote code execution vulnerability. The theme function will extract a file to "webroot/themes/{Theme Folder], where an attacker can access and execute arbitrary code.

Frequently asked questions

What is CVE-2021-40189?: PHPFusion 9.03.110 is affected by a remote code execution vulnerability. The theme function will extract a file to "webroot/themes/{Theme Folder], where an attacker can access and execute arbitrary code.
How severe is CVE-2021-40189?: CVE-2021-40189 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-40189 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-40189?: CVE-2021-40189 affects Php-fusion Phpfusion. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-40189?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-40189 published?: CVE-2021-40189 was published on 2021-10-11 and last updated on 2026-06-17.

References

https://github.com/PHPFusion/PHPFusion/issues/2374

Affected products (1)

cpe:2.3:a:php-fusion:phpfusion:9.03.110:*:*:*:*:*:*:*

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