Vulnerability details
CVE-2026-8143
omnivo Booking Calendar – Event Calendar
Booking Calendar – Event Calendar <= 2.1.6 - Unauthenticated Stored Cross-Site Scripting via Multiple Parameters
CVSS 3.1
7.2High
Official description
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 scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 7.2High | 3.1 | CVEProject cvelistV5 (CNA) (Wordfence) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| omnivo | Booking Calendar – Event Calendar | v ≤ 2.1.6 | CVEProject cvelistV5 (CNA) |
References and advisories
2
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Details
- Published
- 2026-05-27
- Last updated
- 2026-05-27
- State
- Published
- Assigner (CNA)
- Wordfence
Exploit prediction (EPSS)
0.19%
Probability of exploitation in 30 days
8.7%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')