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My Calendar < 3.7.7 — Unauthenticated Denial of Service

CVE-2026-40308Published · Updated

Action summary

Affected: <3.7.7Update to 3.7.7 or newer

All remediation steps
Watch plugin
Severity
Medium5.3
CVSS
5.3
CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
What does this vector mean?
AV:N Attack vector
Network
AC:L Attack complexity
Low
PR:N Privileges required
None
UI:N User interaction
None
S:U Scope
Unchanged
C:N Confidentiality
None
I:N Integrity
None
A:L Availability
Low
Weakness
CWE-639 Authorization Bypass Through User-Controlled Key
Required access
No account needed
Exploit prediction (EPSS)
No score
CISA KEV
Not listed
On this page8

Am I affected?

My Calendar – Accessible Event Manager my-calendar

  1. Affected< 3.7.7
  2. Patched in3.7.7

Update to 3.7.7 or newer.

You are affected if you run < 3.7.7. Version 3.7.7 and later are not affected by this issue.

  • Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under My Calendar – Accessible Event Manager.
  • No admin access? Run a passive check of your site. It reads public files only.
  • No account is needed to exploit this. Treat any exposed site on an affected version as at risk.

What to do

  1. Update to version 3.7.7, or a newer patched version
  2. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
  3. Watch My Calendar – Accessible Event Manager to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence, credited to minhi1.

The My Calendar – Accessible Event Manager plugin for WordPress is vulnerable to Denial of Service in all versions up to 3.7.7 (exclusive). This makes it possible for unauthenticated attackers to trigger a fatal error.

Exploits & references

Proof-of-concept & detection

No public proof-of-concept or detection template is known for this vulnerability.

Advisories & patches

More in My Calendar – Accessible Event Manager

All 24
More vulnerabilities in My Calendar – Accessible Event Manager
SeverityVulnerabilityCVEPublished
Medium6.53.8.11 - Unauthenticated Arbitrary Shortcode Execution
3.8.8 – <3.8.11Update to 3.8.11
CVE-2026-119714
Critical9.8Unauthenticated Privilege Escalation to 'mcs' Parameter via Reflected Shortcode Injection into 'above' Attribute
≤3.8.7Update to 3.4.25 or 3.5.22 or 3.6.18 or 3.7.18 or 3.8.8
CVE-2026-104798
Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting via 'fallback' Shortcode Attribute
≤3.8.3Update to 3.8.4
CVE-2026-77186
Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting via 'before' and 'after' Shortcode Attributes
≤3.8.3Update to 3.8.4
CVE-2026-77187
High7.5Unauthenticated SQL Injection via 'mc_auth' and 'mc_host' Parameters
≤3.7.8Update to 3.7.9
CVE-2026-6854

Timeline

  1. CVE published

    Severity medium, CVSS 5.3

  2. Record last updated

Sources & licenses

Wordfence record
Vulnerability data
Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
CVE® identifiers
Copyright 1999-2026 The MITRE Corporation. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
CVSS / CWE
National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
VulnCrest content
Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.

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