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Vulnerabilities

Vulnerability · CVE-2026-104798

The My Calendar – Accessible Event Manager plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 3.8.7.

Published Oct 16, 2026 · catalog updated Oct 16, 2026 · The My Calendar –

Check if you run it

No confirmed exploitation is on record for CVE-2026-104798. EPSS is 0.89%. Act only if a listed version of The My Calendar – is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (The My Calendar –).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.89%
Remediation
Version ranges on file
Affected products
stated named in the record

The My Calendar – Accessible Event Manager plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 3.8.7. The public GET parameter is reflected into post content unsanitized before WordPress core's filter runs, allowing an unauthenticated attacker to inject a nested shortcode; then splits the attribute on commas and dispatches each element via with no authentication, authorization, or callable allowlist check. This makes it possible for unauthenticated attackers to invoke arbitrary loaded PHP functions, enabling a call chain in which the shortcode array is passed to — which PHP coerces to integer as the argument — overwriting the credentials of the initial Administrator account (user ID 1) and granting the attacker full wp-admin access. Exploitation is trivially reachable via the plugin's auto-generated page, which is publicly accessible by default upon plugin activation.

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.

  • stated named in the record<= 3.8.7

How to fix CVE-2026-104798

What to do

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

Should you patch?

No confirmed exploitation is on record for CVE-2026-104798. EPSS is 0.89%. Act only if a listed version of The My Calendar – is installed.

Which versions are affected?

Compare what you have installed with named in the record <= 3.8.7. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-269: Improper Privilege Management. EPSS 0.89%. There is no CISA KEV listing. 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.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 16, 2026 · NIST NVD

    Detected

    The My Calendar – Accessible Event Manager plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 3.8.7. The public GET parameter is reflected into post content unsanitized before WordPress core's filter runs, allowing an unauthenticated attacker to inject a nested shortcode; then splits the attribute on commas and dispatches each element via with no authe

Sources

  • CVE.orgVulnerability recordCVE-2026-104798

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-104798

    30-day exploitation probability 0.9%

    first.org
  • NIST NVDVulnerability recordCVE-2026-104798

    The My Calendar – Accessible Event Manager plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 3.8.7. The public GET parameter is reflected into post content unsanitized before WordPress core's filter runs, allowin

    nvd.nist.gov

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.