How severe is CVE-2021-24427?

CVE-2021-24427 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-2021-24427 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-24427?

CVE-2021-24427 affects Boldgrid W3 Total Cache. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-24427?

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

When was CVE-2021-24427 published?

CVE-2021-24427 was published on 2021-07-12 and last updated on 2026-06-17.

CVE-2021-24427

CVE-2021-24427 is a medium-severity vulnerability in Boldgrid W3 Total Cache 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% (46th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Boldgrid W3 Total Cache
Published: 2021-07-12
Last modified: 2026-06-17

Description

The W3 Total Cache WordPress plugin before 2.1.3 did not sanitise or escape some of its CDN settings, allowing high privilege users to use JavaScript in them, which will be output in the page, leading to an authenticated Stored Cross-Site Scripting issue

Frequently asked questions

What is CVE-2021-24427?: The W3 Total Cache WordPress plugin before 2.1.3 did not sanitise or escape some of its CDN settings, allowing high privilege users to use JavaScript in them, which will be output in the page, leading to an authenticated Stored Cross-Site Scripting issue
How severe is CVE-2021-24427?: CVE-2021-24427 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-2021-24427 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-24427?: CVE-2021-24427 affects Boldgrid W3 Total Cache. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-24427?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-24427 published?: CVE-2021-24427 was published on 2021-07-12 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:boldgrid:w3_total_cache:*:*:*:*:*:wordpress:*:*

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