How severe is CVE-2021-40541?

CVE-2021-40541 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-40541 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-40541?

CVE-2021-40541 affects Php-fusion Phpfusion. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-40541?

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

When was CVE-2021-40541 published?

CVE-2021-40541 was published on 2021-10-11 and last updated on 2026-06-17.

CVE-2021-40541

CVE-2021-40541 is a medium-severity vulnerability in Php-fusion Phpfusion with a CVSS 3.x base score of 6.1. 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 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 1% (42nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Php-fusion Phpfusion
Published: 2021-10-11
Last modified: 2026-06-17

Description

PHPFusion 9.03.110 is affected by cross-site scripting (XSS) in the preg patterns filter html tag without "//" in descript() function An authenticated user can trigger XSS by appending "//" in the end of text.

Frequently asked questions

What is CVE-2021-40541?: PHPFusion 9.03.110 is affected by cross-site scripting (XSS) in the preg patterns filter html tag without "//" in descript() function An authenticated user can trigger XSS by appending "//" in the end of text.
How severe is CVE-2021-40541?: CVE-2021-40541 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-40541 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-40541?: CVE-2021-40541 affects Php-fusion Phpfusion. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-40541?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-40541 published?: CVE-2021-40541 was published on 2021-10-11 and last updated on 2026-06-17.

References

https://github.com/PHPFusion/PHPFusion/issues/2373

Affected products (1)

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

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