VulnSocial

CVE-2026-40308Disclosure

LOWCVSS 8.8 · HIGH

Exploit discussion active in current signal (1 latest mentions)

Immediate actions

  • Hunt for exploitation attempts and persistence artifacts
  • Increase monitoring for publicly documented tradecraft
  • Track advisory updates for patch or workaround availability

Recommended action window: High priority (within 72h)

NVD description

My Calendar is a WordPress plugin for managing calendar events. In versions 3.7.6 and below, the mc_ajax_mcjs_action AJAX endpoint, registered for unauthenticated users, passes user-supplied arguments through parse_str() without validation, allowing injection of arbitrary parameters including a site value. On WordPress Multisite installations, this enables an unauthenticated attacker to call switch_to_blog() with an arbitrary site ID and extract calendar events from any sub-site on the network, including private or hidden events. On standard Single Site installations, switch_to_blog() does not exist, causing an uncaught PHP fatal error and crashing the worker thread, creating an unauthenticated denial of service vector. This issue has been fixed in version 3.7.7.

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1.5/ 10 priority

Sources & remediation

Other references
Weakness type (CWE)
CWE-639

Priority

LOW

Exploitation

NONE

PoC

YES

Patch

NONE

Momentum

STABLE

Threat summary

  • Public PoC is present in monitored signal
  • 2 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • PoC mentioned or linked in 1 signal
  • Technical details provided in 2 signals
  • Disclosure: 2 classified signals
  • Peaked 1d ago at 1 mentions (2026-04-17); latest day: 1
  • 2 total mentions across 2 days

Deep dive

Activity timeline2 mentions / 2d
00111Mentions · 2026-04-17: 1Mentions · 2026-04-22: 1PoC Mentioned / Linked · 2026-04-22: 1Technical Details · 2026-04-17: 1Technical Details · 2026-04-22: 104-1704-22
Signal classification1 categories
Disclosure
2100.0%
Referenced assets2 URLs
Full discourse2 posts
  • pdnuclei-bot@pdnuclei_bot
    Disclosure

    🚨 CVE-2026-40308 - high 🚨 My Calendar WordPress Plugin - Information Disclosure > My Calendar WordPress plugin <= 3.7.6 contains an injection vulnerability caused by u... 👾 https://cloud.projectdiscovery.io/library/CVE-2026-40308 @pdnuclei #NucleiTemplates #cve

    Post summary

    The tweet announces CVE-2026-40308, detailing an information disclosure injection flaw in My Calendar WordPress plugin, linking to a Nuclei template but providing no exploitation or patch information.

    00001149
    942 followersView on X
  • CVE@CVEnew
    Disclosure

    CVE-2026-40308 My Calendar is a WordPress plugin for managing calendar events. In versions 3.7.6 and below, the mc_ajax_mcjs_action AJAX endpoint, registered for unauthenticated use… https://www.cve.org/CVERecord?id=CVE-2026-40308

    Post summary

    The text highlights CVE-2026-40308 as a vulnerability in the My Calendar WordPress plugin, specifically an unauthenticated use of the mc_ajax_mcjs_action AJAX endpoint in versions 3.7.6 and earlier.

    0000075
    57.2K followersView on X

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