Authorization Bypass Through User-Controlled Key Affecting joedolson/my-calendar package, versions <3.7.7
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-PHP-JOEDOLSONMYCALENDAR-16109617
- published19 Apr 2026
- disclosed16 Apr 2026
- creditminhi1
Introduced: 16 Apr 2026
CVE-2026-40308 (opens in a new tab)How to fix?
Upgrade joedolson/my-calendar to version 3.7.7 or higher.
Overview
Affected versions of this package are vulnerable to Authorization Bypass Through User-Controlled Key via the mc_ajax_mcjs_action function. An attacker can access sensitive event data from other sub-sites or cause a denial of service by sending crafted requests to the unauthenticated endpoint, injecting arbitrary parameters into the site argument. This is only exploitable if the WordPress installation is configured as a Multisite for information disclosure, or as a Single Site for denial of service.