{
 "id": "WPSEC-2026-2413",
 "url": "https://wpsec.com/vuln/WPSEC-2026-2413/",
 "json_url": "https://wpsec.com/vuln/WPSEC-2026-2413/advisory.json",
 "markdown_url": "https://wpsec.com/vuln/WPSEC-2026-2413/index.md",
 "title": "Open Source Event Calendar <= 1.2.0 - Authenticated (Author+) Missing Authorization to Arbitrary Post Modification via 'Edit this instance'",
 "description": "The Open Source Event Calendar plugin for WordPress is vulnerable to unauthorized modification of data via the 'Edit this instance' occurrence handler (EventParent::admin_init_post() and EventEditing::create_duplicate_post()) in all versions up to, and including, 1.2.0. This is due to a missing capability check on the submitted post_ID, and to the handler passing every submitted post field (such as ID, post_type and meta_input) to wp_insert_post(). The handler runs on admin_action_editpost, before WordPress core's own edit checks. This makes it possible for authenticated attackers with author-level access and above (or the plugin's Event Contributor role) to change other users' events and their recurrence dates, and to overwrite arbitrary posts and add arbitrary post meta.",
 "plugin": {
  "slug": "open-source-event-calendar",
  "name": "Open Source Event Calendar",
  "full_name": "Open Source Event Calendar",
  "wordpress_org": "https://wordpress.org/plugins/open-source-event-calendar/",
  "advisories_url": "https://wpsec.com/vuln/plugin/open-source-event-calendar/",
  "attacksurface": "https://attacksurface.wpsec.com/plugin/open-source-event-calendar"
 },
 "type": "NO AUTHORISATION",
 "cwe": [
  "CWE-862"
 ],
 "cve": [],
 "cvss": {
  "version": "3.1",
  "score": 6.5,
  "vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
  "severity": "Medium"
 },
 "affected": {
  "ranges": [
   {
    "from": null,
    "from_inclusive": true,
    "to": "1.2.1",
    "to_inclusive": false
   }
  ],
  "text": [
   "all versions before 1.2.1"
  ]
 },
 "introduced_in": null,
 "fixed_in": "1.2.1",
 "remediation": "Update to 1.2.1 or later.",
 "fix_released": "2026-11-02T16:13:11+00:00",
 "published": "2026-11-03T16:48:13+00:00",
 "updated": "2026-11-03T13:23:12.282324+00:00",
 "also_published_as": null,
 "references": [
  "https://wpsec.com/vuln/WPSEC-2026-2413/",
  "https://plugins.svn.wordpress.org/open-source-event-calendar/tags/1.2.1/",
  "https://wordpress.org/plugins/open-source-event-calendar/"
 ],
 "attacksurface_url": "https://attacksurface.wpsec.com/plugin/open-source-event-calendar",
 "source": "WPSec",
 "license": {
  "name": "CC BY 4.0",
  "url": "https://creativecommons.org/licenses/by/4.0/"
 },
 "usage": {
  "plugin": "Low",
  "affected_versions": "Low",
  "as_of": "2026-11-03"
 }
}