# Open Source Event Calendar <= 1.2.0 - Authenticated (Author+) Missing Authorization to Sensitive Information Exposure via Bulk Clone

- **ID:** WPSEC-2026-2411
- **Plugin:** Open Source Event Calendar (`open-source-event-calendar`), https://wordpress.org/plugins/open-source-event-calendar/
- **Affected versions:** all versions before 1.2.1
- **Fixed in:** 1.2.1 (Update to 1.2.1 or later.)
- **Severity:** Medium 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N)
- **Weakness:** CWE-862
- **Usage among sites WPSec scans:** plugin Low, affected versions Low (as of 2026-11-03)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/open-source-event-calendar
- **Fix released:** 2026-11-02
- **Published:** 2026-11-03
- **URL:** https://wpsec.com/vuln/WPSEC-2026-2411/

## Description

The Open Source Event Calendar plugin for WordPress is vulnerable to unauthorized access of data via the bulk 'clone' action in all versions up to, and including, 1.2.0. This is due to a missing check that the current user may read the posts being cloned, and that they are events at all. This makes it possible for authenticated attackers with author-level access and above (or the plugin's Event Contributor role) to clone private, draft or password-protected posts of any type that belong to other users. The attacker then owns the copy and can read its content and all of its post meta.

## References

- https://wpsec.com/vuln/WPSEC-2026-2411/
- https://plugins.svn.wordpress.org/open-source-event-calendar/tags/1.2.1/
- https://wordpress.org/plugins/open-source-event-calendar/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-2411/

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.