Booking Calendar <= 11.8.2 - Reflected Cross-Site Scripting via 'options' Parameter
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- 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 Booking Calendar plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'options' parameter in all versions up to, and including, 11.8.2 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link. The nonce check is bypassed by default because the 'booking_is_nonce_at_front_end' option ships disabled, allowing unauthenticated requests to reach the vulnerable sink without any verification.
Why it matters now
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
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-92561
- 2026-10-03 Alias added: GHSA-c528-79h7-4x96
References
Other 6
- https://www.wordfence.com/threat-intel/vulnerabilities/id/e8645b58-6b2a-4659-a002-d622453bea42?source=cve
- https://plugins.trac.wordpress.org/browser/booking/tags/11.8.2/core/timeline/v2/wpbc-class-timeline_v2.php#L593
- https://plugins.trac.wordpress.org/browser/booking/tags/11.8.2/core/lib/wpbc-ajax.php#L25
- https://plugins.trac.wordpress.org/browser/booking/tags/11.8.2/core/timeline/v2/wpbc-class-timeline_v2.php#L3385
- https://plugins.trac.wordpress.org/browser/booking/tags/11.8.2/core/timeline/v2/wpbc-class-timeline_v2.php#L919
- https://plugins.trac.wordpress.org/changeset?reponame=&old=3699185%40booking&new=3699185%40booking
More wpdevelop vulnerabilities
- TI-2025-13137 Booking Calendar <= 10.14.8 - Unauthenticated SQL Injection via dates_to_check CVSS 3.1HIGH 7.5
- TI-2026-62468 Booking Calendar <= 11.8.2 - Authenticated (Editor+) Privilege Escalation to 'data_name' Parameter CVSS 3.1HIGH 7.2
- TI-2026-24886 WordPress Booking Calendar plugin <= 10.14.15 - SQL Injection vulnerability CVSS 3.1HIGH 7.6
- TI-2026-42521 WordPress Booking Calendar plugin <= 11.4.2 - Cross Site Scripting (XSS) vulnerability CVSS 3.1HIGH 7.1
- TI-2026-51992 WordPress Booking Calendar plugin <= 11.7 - Broken Access Control vulnerability CVSS 3.1MEDIUM 5.3
- TI-2026-01129 Booking Calendar <= 10.14.13 - Missing Authorization to Unauthenticated Booking Details Exposure CVSS 3.1MEDIUM 5.3
Sources
- CVE-2026-92561 · CVE Program
- CVE-2026-92561 · NVD
- FIRST EPSS
- GHSA-c528-79h7-4x96 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences