Stored script execution in administrator browser sessions
Published Aug 22, 2022 · Updated Apr 28, 2026
Stored XSS in Webba Booking 4.2.21 and earlier allows remote authenticated users with administrator access to inject scripts. Patchstack has not published the affected input, storage path, or missing output-encoding operation, so the concrete code locus remains undisclosed. When a privileged user renders the stored payload, its script executes in that user's browser and reads or modifies data available to the session.
Summary
What happened
Stored XSS in Webba Booking 4.2.21 and earlier allows remote authenticated users with administrator access to inject scripts. Patchstack has not published the affected input, storage path, or missing output-encoding operation, so the concrete code locus remains undisclosed. When a privileged user renders the stored payload, its script executes in that user's browser and reads or modifies data available to the session.
The record
- CVE
- CVE-2021-36847
- Published
- Aug 22, 2022
- Updated
- Apr 28, 2026
- Vendor
- Webba Appointment Booking
- Product
- Webba Booking
- Classifications
- CWE-79, T1203
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- Aug 22, 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
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=<= 4.2.21 <=4.2.21
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.
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Technologies
Your stack
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Your stack
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