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TI-2026-83189 Aliases CVE-2026-119714GHSA-j2m8-rg5v-vvqc

Shortcode injection in My Calendar WordPress plugin via mcs parameter

Priority LOW 36CWE-94Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Code execution
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-94.

Summary

My Calendar WordPress plugin from 3.8.8 before 3.8.11 contains a shortcode injection flaw (CWE-94) where the mcs search parameter reaches do_shortcode without bracket encoding. An unauthenticated remote attacker can make a GET request that executes registered shortcodes on any page or post, enabling content injection and spoofing.

Written with Claude Haiku 5.5 from the sources below · 2026-11-05

Description from the CNA

My Calendar WordPress plugin 3.8.8 before 3.8.11 contains a shortcode injection vulnerability that allows unauthenticated attackers to execute registered shortcodes via the mcs search parameter. The mcs value reaches mc_search_results() in src/my-calendar-search.php without bracket encoding before do_shortcode runs, so a GET request triggers shortcodes on any page or post, enabling content injection and spoofing.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00309 23rd percentileScored 2026-11-07
Fix Fixed My Calendar - Accessible Event Manager (joedolson): 3.8.11

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
joedolsonMy Calendar - Accessible Event Manager3.8.8 to before 3.8.113.8.11Patch availableCNA
  • My Calendar - Accessible Event Manager Vendorjoedolson Affected 3.8.8 to before 3.8.11 Fixed in 3.8.11 Patch available CNA

Remediation

Update My Calendar - Accessible Event Manager to version 3.8.11, which is the fixed version.

Written with Claude Haiku 5.5 from the sources below · 2026-11-05

  • Fix · CNA My Calendar - Accessible Event Manager (joedolson) Fixed in 3.8.11

Timeline

  1. 2026-10-30 Threatist record created from CVE-2026-119714
  2. 2026-10-30 CISA SSVC decision points changed
  3. 2026-10-30 Priority changed: MEDIUM → LOW
  4. 2026-10-30 Alias added: GHSA-j2m8-rg5v-vvqc

References

Patch 1

Other 3

  • TI-2023-05838 SQL injection in my-calendar CVSS 3.1CRITICAL 9.8
  • TI-2026-29085 My Calendar: Unauthenticated Information Disclosure (IDOR) via Multisite switch_to_blog CVSS 4.0HIGH 8.8
  • TI-2024-01186 My Calendar < 3.4.24 - Authenticated Stored XSS CVSS 3.1MEDIUM 5.4
  • TI-2026-75163 Unauthenticated privilege escalation in My Calendar WordPress plugin CVSS 3.1CRITICAL 9.8
  • TI-2025-03313 My Tickets – Accessible Event Ticketing <= 2.0.16 - Authenticated (Subscriber+) Privilege Escalation CVSS 3.1HIGH 8.8
  • TI-2026-21820 WordPress My Tickets plugin <= 2.1.0 - Sensitive Data Exposure vulnerability CVSS 3.1HIGH 7.5
See all 22 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences