How severe is CVE-2021-24687?

CVE-2021-24687 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-2021-24687 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-2021-24687?

CVE-2021-24687 affects Webnus Modern Events Calendar Lite. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-24687?

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

When was CVE-2021-24687 published?

CVE-2021-24687 was published on 2021-10-04 and last updated on 2026-06-17.

CVE-2021-24687

CVE-2021-24687 is a medium-severity vulnerability in Webnus Modern Events Calendar Lite 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% (44th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Webnus Modern Events Calendar Lite
Published: 2021-10-04
Last modified: 2026-06-17

Description

The Modern Events Calendar Lite WordPress plugin before 5.22.2 does not escape some of its settings before outputting them in attributes, allowing high privilege users to perform Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed.

Frequently asked questions

What is CVE-2021-24687?: The Modern Events Calendar Lite WordPress plugin before 5.22.2 does not escape some of its settings before outputting them in attributes, allowing high privilege users to perform Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed.
How severe is CVE-2021-24687?: CVE-2021-24687 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-2021-24687 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-2021-24687?: CVE-2021-24687 affects Webnus Modern Events Calendar Lite. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-24687?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-24687 published?: CVE-2021-24687 was published on 2021-10-04 and last updated on 2026-06-17.

References

https://wpscan.com/vulnerability/300ba418-63ed-4c03-9031-263742ed522e

Affected products (1)

cpe:2.3:a:webnus:modern_events_calendar_lite:*:*:*:*:*:wordpress:*:*

More vulnerabilities in Webnus Modern Events Calendar Lite

CVE-2021-24946 — Critical (CVSS 9.8): The Modern Events Calendar Lite WordPress plugin before 6.1.5 does not sanitise and escape the time parameter before…
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CVE-2021-24149 — High (CVSS 8.8): Unvalidated input in the Modern Events Calendar Lite WordPress plugin, versions before 5.16.6, did not sanitise the…
CVE-2024-6522 — High (CVSS 8.5): The Modern Events Calendar plugin for WordPress is vulnerable to Server-Side Request Forgery in all versions up to, and…
CVE-2021-24146 — High (CVSS 7.5): Lack of authorisation checks in the Modern Events Calendar Lite WordPress plugin, versions before 5.16.5, did not…
CVE-2021-24145 — High (CVSS 7.2): Arbitrary file upload in the Modern Events Calendar Lite WordPress plugin, versions before 5.16.5, did not properly…

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