TI-2026-07174 Aliases CVE-2026-8143 GHSA-j6cw-vh4x-xqjh

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

LOW 31CWE-79Published 2026-05-27 · Updated 2026-05-27

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Cross-site scripting
Confidentiality · integrity · availability: Low · Low · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

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).

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.0019 8th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
omnivo	Booking Calendar – Event Calendar	up to 2.1.6	—	No fix listed	CNA

Booking Calendar – Event Calendar Vendoromnivo Affected up to 2.1.6 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-8143
2026-10-03 Alias added: GHSA-j6cw-vh4x-xqjh

References

Other 2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences