CVE-2021-24712

Appointment Hour Booking <= 1.3.16 - Cross-Site Scripting

2021-09-10 00:00

Strategic Overview

Status: Patched in 1.3.17
Affected Plugin: Appointment Hour Booking – Booking Calendar
Affected Version: < 1.3.17
CVSS: 6.4Medium
Weakness type: CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE: CVE-2021-24712

View all Appointment Hour Booking – Booking Calendar vulnerabilities

At a glance

CVE-2021-24712 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Appointment Hour Booking WordPress plugin, affecting versions < 1.3.17. It carries a CVSS score of 6.4 (reachable over the network; low attack complexity). The issue is fixed in version 1.3.17; sites on affected versions should update now. Disclosed September 2021, reported by Shivam Rai.

Vulnerability Overview

The Appointment Hour Booking WordPress plugin before 1.3.17 does not properly sanitize values used when creating new calendars.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no interaction from a victim user.

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Reaching this weakness in Appointment Hour Booking < 1.3.17 takes a caller who can reach the endpoint. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.

Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. For Appointment Hour Booking the fix is 1.3.17: builds < 1.3.17 are affected, anything from 1.3.17 onward is not.

Remediation

Update to version 1.3.17, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Appointment Hour Booking: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Appointment Hour Booking 1.3.17 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-24712 https://www.wordfence.com/threat-intel/vulnerabilities/id/75cc74f6-aaab-4d5a-bd71-c238fa74a9bb https://nvd.nist.gov/vuln/detail/CVE-2021-24712

Related records

Same weakness class

Other vulnerabilities in Appointment Hour Booking – Booking Calendar

CVSS Vector

6.4

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeChanged
ConfidentialityLow
IntegrityLow
AvailabilityNone

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