How severe is CVE-2021-4404?

CVE-2021-4404 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2021-4404 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-4404?

CVE-2021-4404 affects Eventespresso Event Espresso 4 Decaf. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-4404?

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

When was CVE-2021-4404 published?

CVE-2021-4404 was published on 2023-07-01 and last updated on 2026-06-17.

CVE-2021-4404

CVE-2021-4404 is a medium-severity vulnerability in Eventespresso Event Espresso 4 Decaf with a CVSS 3.x base score of 4.3. 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: Medium (CVSS 3.x base score 4.3)
EPSS exploit prediction: 0% (31st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-352
Affected product: Eventespresso Event Espresso 4 Decaf
Published: 2023-07-01
Last modified: 2026-06-17

Description

The Event Espresso 4 Decaf plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 4.10.11. This is due to missing or incorrect nonce validation on the ajaxHandler() function. This makes it possible for unauthenticated attackers to op into notifications via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

Frequently asked questions

What is CVE-2021-4404?: The Event Espresso 4 Decaf plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 4.10.11. This is due to missing or incorrect nonce validation on the ajaxHandler() function. This makes it possible for unauthenticated attackers to op into notifications via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.
How severe is CVE-2021-4404?: CVE-2021-4404 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2021-4404 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-4404?: CVE-2021-4404 affects Eventespresso Event Espresso 4 Decaf. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-4404?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-4404 published?: CVE-2021-4404 was published on 2023-07-01 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:eventespresso:event_espresso_4_decaf:*:*:*:*:*:wordpress:*:*

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