CVE-2021-24606: Availability Calendar < 1.2.1 - Authenticated SQL Injection

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-09-20 · updated 2026-06-17
Weakness: CWE-89

Description

The Availability Calendar WordPress plugin before 1.2.1 does not escape the category attribute from its shortcode before using it in a SQL statement, leading to a SQL Injection issue, which can be exploited by any user able to add shortcode to posts/pages, such as contributor+

Affected products

Availability Calendar: before 1.2.1 — fixed in 1.2.1

How to fix

Upgrade to a fixed version: Availability Calendar 1.2.1. Check the vendor advisory for mitigations.

References

https://wpscan.com/vulnerability/fe49f48a-f97a-44fe-8d71-be08e7ce4f83
https://wpscan.com/vulnerability/fe49f48a-f97a-44fe-8d71-be08e7ce4f83

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