Events Calendar import route permits unauthenticated import tampering
The Events Calendar before 6.16.5.1 omits authentication from an Event Aggregator import REST route and skips an integrity check for one import status. An unauthenticated attacker can mark imports as failed and store arbitrary content in a hidden comment, disrupting aggregation and creating a persistent content primitive. The CNA record does not identify the REST route, status value, parameters or handler function.
- Component
- The Events Calendar
- Plugin slug
events-calendar- Affected
- < 6.16.5.1
- Safe version
6.16.5.1- Published
- Jul 27, 2026
- Weakness
- CWE-862 — Missing Authorization
This CVE was published Jul 27, 2026 and is one of 4 known issues for this plugin.
Update, patch or deactivate.
Update The Events Calendar to 6.16.5.1 or later. Review failed Event Aggregator imports and associated hidden comments for attacker-controlled content, remove suspicious records and re-run legitimate imports.
A safe version is available, so updating to that version or later is the preferred remediation. If an immediate update is not practical, consider a targeted application patch or temporarily restricting the affected functionality.
Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.
Technical description
The Events Calendar WordPress plugin before 6.16.5.1 does not perform an authorization check on one of its Event Aggregator import REST API routes and skips an integrity check for a particular status value, allowing unauthenticated attackers to mark existing import records as failed and to store arbitrary content in a hidden comment record.
CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N