How severe is CVE-2021-42358?

CVE-2021-42358 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-2021-42358 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-42358?

CVE-2021-42358 affects Contact Form With Captcha Project Contact Form With Captcha. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-42358?

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-2021-42358 published?

CVE-2021-42358 was published on 2021-11-29 and last updated on 2026-06-17.

CVE-2021-42358

CVE-2021-42358 is a high-severity vulnerability in Contact Form With Captcha Project Contact Form With Captcha 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% (45th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-352
Affected product: Contact Form With Captcha Project Contact Form With Captcha
Published: 2021-11-29
Last modified: 2026-06-17

Description

The Contact Form With Captcha WordPress plugin is vulnerable to Cross-Site Request Forgery due to missing nonce validation in the ~/cfwc-form.php file during contact form submission, which made it possible for attackers to inject arbitrary web scripts in versions up to, and including 1.6.2.

Frequently asked questions

What is CVE-2021-42358?: The Contact Form With Captcha WordPress plugin is vulnerable to Cross-Site Request Forgery due to missing nonce validation in the ~/cfwc-form.php file during contact form submission, which made it possible for attackers to inject arbitrary web scripts in versions up to, and including 1.6.2.
How severe is CVE-2021-42358?: CVE-2021-42358 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-2021-42358 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-42358?: CVE-2021-42358 affects Contact Form With Captcha Project Contact Form With Captcha. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-42358?: 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-2021-42358 published?: CVE-2021-42358 was published on 2021-11-29 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:contact_form_with_captcha_project:contact_form_with_captcha:*:*:*:*:*:wordpress:*:*

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