How severe is CVE-2021-24876?

CVE-2021-24876 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-24876 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-24876?

CVE-2021-24876 affects Roundupwp Registrations For The Events Calendar. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-24876?

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

When was CVE-2021-24876 published?

CVE-2021-24876 was published on 2021-11-29 and last updated on 2026-06-17.

CVE-2021-24876

CVE-2021-24876 is a medium-severity vulnerability in Roundupwp Registrations For The Events Calendar with a CVSS 3.x base score of 6.1. 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 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 1% (63rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Roundupwp Registrations For The Events Calendar
Published: 2021-11-29
Last modified: 2026-06-17

Description

The Registrations for the Events Calendar WordPress plugin before 2.7.5 does not escape the v parameter before outputting it back in an attribute, leading to a Reflected Cross-Site Scripting

Frequently asked questions

What is CVE-2021-24876?: The Registrations for the Events Calendar WordPress plugin before 2.7.5 does not escape the v parameter before outputting it back in an attribute, leading to a Reflected Cross-Site Scripting
How severe is CVE-2021-24876?: CVE-2021-24876 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-24876 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-24876?: CVE-2021-24876 affects Roundupwp Registrations For The Events Calendar. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-24876?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-24876 published?: CVE-2021-24876 was published on 2021-11-29 and last updated on 2026-06-17.

References

https://wpscan.com/vulnerability/e77c2493-993d-418d-9629-a1f07b5a2b6f

Affected products (1)

cpe:2.3:a:roundupwp:registrations_for_the_events_calendar:*:*:*:*:*:wordpress:*:*

More vulnerabilities in Roundupwp Registrations For The Events Calendar

CVE-2021-24943 — Critical (CVSS 9.8): The Registrations for the Events Calendar WordPress plugin before 2.7.6 does not sanitise and escape the event_id in…
CVE-2024-7982 — Critical (CVSS 9.6): The Registrations for the Events Calendar WordPress plugin before 2.12.4 does not sanitise and escape some parameters…
CVE-2024-39638 — High (CVSS 8.5): Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') vulnerability in Roundup WP…
CVE-2024-10703 — Medium (CVSS 6.1): The Registrations for the Events Calendar WordPress plugin before 2.13.4 does not sanitise and escape some of its…
CVE-2021-25083 — Medium (CVSS 6.1): The Registrations for the Events Calendar WordPress plugin before 2.7.10 does not escape the qtype parameter before…

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