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Vulnerabilities

Vulnerability · CVE-2021-24498

dwbooster calendar_event_multi_view Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Published Jun 8, 2025 · catalog updated Jun 8, 2025 · dwbooster calendar_event_multi_view Improper Neutralization

Patch now

CVE-2021-24498 is in the CISA known-exploited catalog. Confirm dwbooster calendar_event_multi_view 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 (dwbooster calendar_event_multi_view 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
3.54%
Remediation
Remediation guidance
Affected products
vendor dwbooster calendar_event_multi_view

The Calendar Event Multi View WordPress plugin before 1.4.01 does not sanitise or escape the 'start' and 'end' GET parameters before outputting them in the page (via php/edit.php), leading to a reflected Cross-Site Scripting issue.

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 dwbooster calendar_event_multi_viewversion unspecified

How to fix CVE-2021-24498

What to do

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

Should you patch?

CVE-2021-24498 is in the CISA known-exploited catalog. Confirm dwbooster calendar_event_multi_view 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 3.54%. 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. Jun 8, 2025 · VulnCheck KEV

    Detected

    The Calendar Event Multi View WordPress plugin before 1.4.01 does not sanitise or escape the 'start' and 'end' GET parameters before outputting them in the page (via php/edit.php), leading to a reflected Cross-Site Scripting issue.

  2. Jun 8, 2025 · 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-2021-24498

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2021-24498

    30-day exploitation probability 3.5%

    first.org
  • VulnCheck KEVConfirmed exploitationCVE-2021-24498

    The Calendar Event Multi View WordPress plugin before 1.4.01 does not sanitise or escape the 'start' and 'end' GET parameters before outputting them in the page (via php/edit.php), leading to a reflected Cross-Site Scripting issue.

    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.