CVE-2023-50860

Booking for Appointments and Events Calendar – Amelia <= 1.0.85 - Stored Cross-Site Scripting via Shortcode

2023-12-22 00:00
Ngô Thiên An (ancorn_)

Strategic Overview

Status
Patched in 1.0.86
Affected Plugin
Booking for Appointments and Events Calendar – Amelia
Affected Version
<= 1.0.85
CVSS
6.4Medium
Weakness type
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE
CVE-2023-50860
View all Booking for Appointments and Events Calendar – Amelia vulnerabilities

At a glance

CVE-2023-50860 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Booking for Appointments and Events Calendar WordPress plugin, affecting versions <= 1.0.85. It carries a CVSS score of 6.4 (reachable over the network; low attack complexity). The issue is fixed in version 1.0.86; sites on affected versions should update now. Disclosed December 2023, reported by Ngô Thiên An (ancorn_).

Vulnerability Overview

The Booking for Appointments and Events Calendar – Amelia plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's shortcode(s) in all versions up to, and including, 1.0.85 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers with contributor-level and above permissions to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

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 Booking for Appointments and Events Calendar <= 1.0.85 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 Booking for Appointments and Events Calendar the fix is 1.0.86: builds <= 1.0.85 are affected, anything from 1.0.86 onward is not.

Remediation

Update to version 1.0.86, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Booking for Appointments and Events Calendar: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Booking for Appointments and Events Calendar 1.0.86 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2023-50860https://www.wordfence.com/threat-intel/vulnerabilities/id/33398af8-7b7f-47e5-b95b-c9faa33d0c80https://nvd.nist.gov/vuln/detail/CVE-2023-50860

Related records

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