Administrator-session script execution via forged AJAX requests
Published Sep 30, 2022 · Updated Apr 28, 2026
Cross-site scripting in Booking Ultra Pro 1.1.4 and earlier allows remote attackers to inject JavaScript through forged AJAX requests. Most AJAX actions lack correct WordPress nonce validation, so an attacker-controlled page can submit requests through an administrator's session. An authenticated administrator must interact with crafted content; successful exploitation runs attacker-supplied script and can alter plugin settings or expose staff data.
Summary
What happened
Cross-site scripting in Booking Ultra Pro 1.1.4 and earlier allows remote attackers to inject JavaScript through forged AJAX requests. Most AJAX actions lack correct WordPress nonce validation, so an attacker-controlled page can submit requests through an administrator's session. An authenticated administrator must interact with crafted content; successful exploitation runs attacker-supplied script and can alter plugin settings or expose staff data.
The record
- CVE
- CVE-2021-36855
- Published
- Sep 30, 2022
- Updated
- Apr 28, 2026
- Vendor
- Booking Ultra Pro
- Product
- Booking Ultra Pro Appointments Booking Calendar Plugin
- Classifications
- CWE-79, CWE-352, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 30, 2022CVE publishedPublication date reported by the CVE source.
- Apr 28, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=<= 1.1.4 <=1.1.4
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo