How severe is CVE-2021-24159?

CVE-2021-24159 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-24159 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-24159?

CVE-2021-24159 affects Rocklobster Contact Form 7. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-24159?

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-2021-24159 published?

CVE-2021-24159 was published on 2021-04-05 and last updated on 2026-06-17.

CVE-2021-24159

CVE-2021-24159 is a high-severity vulnerability in Rocklobster Contact Form 7 with a CVSS 3.x base score of 8.8. 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-352.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.8
EPSS exploit prediction: 1% (44th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-352
Affected product: Rocklobster Contact Form 7
Published: 2021-04-05
Last modified: 2026-06-17

Description

Due to the lack of sanitization and lack of nonce protection on the custom CSS feature, an attacker could craft a request to inject malicious JavaScript on a site using the Contact Form 7 Style WordPress plugin through 3.1.9. If an attacker successfully tricked a site’s administrator into clicking a link or attachment, then the request could be sent and the CSS settings would be successfully updated to include malicious JavaScript.

Frequently asked questions

What is CVE-2021-24159?: Due to the lack of sanitization and lack of nonce protection on the custom CSS feature, an attacker could craft a request to inject malicious JavaScript on a site using the Contact Form 7 Style WordPress plugin through 3.1.9. If an attacker successfully tricked a site’s administrator into clicking a link or attachment, then the request could be sent and the CSS settings would be successfully updated to include malicious JavaScript.
How severe is CVE-2021-24159?: CVE-2021-24159 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-24159 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-24159?: CVE-2021-24159 affects Rocklobster Contact Form 7. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-24159?: 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-2021-24159 published?: CVE-2021-24159 was published on 2021-04-05 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:rocklobster:contact_form_7:*:*:*:*:*:wordpress:*:*

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