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Vulnerabilities

Vulnerability · CVE-2021-24876

roundupwp registrations_for_the_events_calendar Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Published Oct 27, 2021 · catalog updated Oct 27, 2021 · roundupwp registrations_for_the_events_calendar Improper Neutralization

Patch now

CVE-2021-24876 is in the CISA known-exploited catalog. Confirm roundupwp registrations_for_the_events_calendar Improper Neutralization against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (roundupwp registrations_for_the_events_calendar Improper Neutralization).
  • No version range is stored. A customer cannot check an installed version against this record.
Severity
Unknown—
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
1.20%
Remediation
Remediation guidance
Affected products
vendor roundupwp registrations_for_the_events_calendar

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

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor roundupwp registrations_for_the_events_calendarversion unspecified

How to fix CVE-2021-24876

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2021-24876 is in the CISA known-exploited catalog. Confirm roundupwp registrations_for_the_events_calendar Improper Neutralization against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Affected version ranges are not on this record. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

No weakness class is stored. EPSS 1.20%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

WordPress security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 27, 2021 · VulnCheck KEV

    Detected

    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

  2. Oct 27, 2021 · CISA KEV

    Known exploited

    Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

Sources

  • CVE.orgVulnerability recordCVE-2021-24876

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2021-24876

    30-day exploitation probability 1.2%

    first.org
  • VulnCheck KEVConfirmed exploitationCVE-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

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.