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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
joedolson My Calendar - Accessible Event Manager unaffected
Version Status Constraints
3.8.8 affected < 3.8.11

No data.

No data.

No data.

Project Subscriptions

Vendors Products
Joedolson Subscribe
My Calendar Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/joedolson/my-calendar cve-icon
https://github.com/joedolson/my-calendar/blob/v3.8.10/src/my-calendar-search.php#L170 cve-icon
https://github.com/joedolson/my-calendar/commit/de875c25d9651abb041b2dfe32f60a4320c66496 cve-icon
https://github.com/joedolson/my-calendar/releases/tag/v3.8.11 cve-icon
https://www.vulncheck.com/advisories/my-calendar-3.8.8-before-3.8.11-unauthenticated-shortcode-injection-via-mcs-parameter cve-icon
History

Fri, 30 Oct 2026 15:30:00 +0000

Type Values Removed Values Added
Description 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.
Title My Calendar 3.8.8 before 3.8.11 Unauthenticated Shortcode Injection via mcs Parameter
First Time appeared Joedolson
Joedolson my Calendar
Weaknesses CWE-94
CPEs cpe:2.3:a:joedolson:my_calendar:*:*:*:*:*:wordpress:*:*
Vendors & Products Joedolson
Joedolson my Calendar
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N'}

cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N'}

Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-30T15:42:00.197Z

Reserved: 2026-10-30T14:49:26.430Z

Link: CVE-2026-119714

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses