# CP Multi View Events Calendar <= 1.4.42 - Unauthenticated Stored Cross-Site Scripting via Event Title

- **ID:** WPSEC-2026-1106
- **Plugin:** CP Multi View Events Calendar (`cp-multi-view-calendar`), https://wordpress.org/plugins/cp-multi-view-calendar/
- **Affected versions:** all versions before 1.4.43
- **Fixed in:** 1.4.43 (Update to 1.4.43 or later.)
- **Severity:** Medium 5.4 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N)
- **Weakness:** CWE-79
- **Usage among sites WPSec scans:** plugin Low, affected versions None seen (as of 2026-10-16)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/cp-multi-view-calendar
- **Fix released:** 2026-10-15
- **Published:** 2026-10-16
- **URL:** https://wpsec.com/vuln/WPSEC-2026-1106/

## Description

The CP Multi View Events Calendar plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the event title in all versions up to, and including, 1.4.42. Titles are stored with sanitize_text_field(), which keeps quote characters. The client-side htmlEscape() helper in jquery.calendar.js removes some tags and event-handler attributes but does not encode quotes, and the calendar templates place the title inside HTML attributes (title1="${title}", title="${title}"). This makes it possible for authenticated attackers with Subscriber-level access and above, and for unauthenticated attackers when a calendar view has public editing enabled, to inject arbitrary web scripts that run whenever a user views the calendar.

## References

- https://wpsec.com/vuln/WPSEC-2026-1106/
- https://plugins.svn.wordpress.org/cp-multi-view-calendar/tags/1.4.43/
- https://wordpress.org/plugins/cp-multi-view-calendar/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-1106/

License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Free to use, share and adapt, also commercially, if you credit WPSec and link to this advisory.