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Vulnerabilities

Vulnerability · CVE-2026-84740

StellarWP the_events_calendar Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

Published Oct 2, 2026 · catalog updated Oct 22, 2026 · StellarWP

Patch now

CVE-2026-84740 is in the CISA known-exploited catalog. Confirm StellarWP against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
Severity
Medium6.5
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
0.22%
Remediation
Remediation guidance
Affected products
vendor StellarWP the_events_calendar · vendor Unknown The Events Calendar

The Events Calendar WordPress plugin before 6.17.5.1 does not validate or sanitise data submitted to an unauthenticated AJAX action before merging it into its rendering context, allowing unauthenticated users to execute arbitrary shortcodes registered on the site.

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 StellarWP the_events_calendarversion unspecified
  • vendor Unknown The Events Calendarversion unspecified

How to fix CVE-2026-84740

What to do

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

Should you patch?

CVE-2026-84740 is in the CISA known-exploited catalog. Confirm StellarWP 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 0.22%. 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 22, 2026 · VulnCheck KEV

    Detected

    The Events Calendar WordPress plugin before 6.17.5.1 does not validate or sanitise data submitted to an unauthenticated AJAX action before merging it into its rendering context, allowing unauthenticated users to execute arbitrary shortcodes registered on the site.

  2. Oct 22, 2026 · 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-2026-84740

    The Events Calendar WordPress plugin before 6.17.5.1 does not validate or sanitise data submitted to an unauthenticated AJAX action before merging it into its rendering context, allowing unauthenticated users to execute arbitrary shortcodes registered on the site.

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-84740

    30-day exploitation probability 0.22%

    first.org
  • VulnCheck KEVConfirmed exploitationCVE-2026-84740

    The Events Calendar WordPress plugin before 6.17.5.1 does not validate or sanitise data submitted to an unauthenticated AJAX action before merging it into its rendering context, allowing unauthenticated users to execute arbitrary shortcodes registered on the site.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 23, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.