Authenticated stored XSS via unescaped settings
Published Oct 4, 2021 · Updated Aug 3, 2024
Cross-site scripting in Appointment Hour Booking before 1.3.16 allows remote authenticated users to execute script via crafted Calendar Form settings. The plugin fails to escape selected Calendar Form configuration values before storing and rendering them, so injected markup executes when an administrator views the affected form settings. Exploitation requires high-privilege WordPress access even when unfiltered_html is disabled, and the demonstrated impact is script execution in an administrator’s browser rather than server-side code execution.
Summary
What happened
Cross-site scripting in Appointment Hour Booking before 1.3.16 allows remote authenticated users to execute script via crafted Calendar Form settings. The plugin fails to escape selected Calendar Form configuration values before storing and rendering them, so injected markup executes when an administrator views the affected form settings. Exploitation requires high-privilege WordPress access even when unfiltered_html is disabled, and the demonstrated impact is script execution in an administrator’s browser rather than server-side code execution.
The record
- CVE
- CVE-2021-24673
- Published
- Oct 4, 2021
- Updated
- Aug 3, 2024
- Vendor
- CodePeople
- Product
- Appointment Hour Booking
- Classifications
- CWE-79, T1189
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Oct 4, 2021CVE publishedPublication date reported by the CVE source.
- Aug 3, 2024Record 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=1.3.16 <1.3.16
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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