High 7.2Published May 27, 2026

CVE-2026-8143Booking Calendar – Event Calendar <= 2.1.6 - Unauthenticated Stored Cross-Site Scripting via Multiple Parameters

Updated under an hour ago (Oct 26, 2026, 7:30 PM ET)

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It affects omnivo Booking Calendar – Event Calendar. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for omnivo Booking Calendar – Event Calendar

Exploited in the last 30 days

The HBook plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'hb_country_iso', 'hb_usa_state_iso', and 'hb_canada_province_iso' parameters in all versions up to, and including, 2.1.6 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page (the HBook Customers admin page).

CVSS: 7.2 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Weakness (CWE): CWE-79
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Wordfence
NVD analysis: Deferred
Record last updated: May 27, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

omnivo Booking Calendar – Event Calendar omnivo:booking_calendar_event_calendar (from the name)	through 2.1.6	CNA record

References

References

https://www.wordfence.com/threat-intel/vulnerabilities/id/e1c16bcb-c188-4e01-9d0b-e4e1a1ef82ee?source=cve
https://codecanyon.net/item/hbook-hotel-booking-system-wordpress-plugin/15059946

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.