What’s Vulnerable › Vulnerabilities

CVE-2021-24604: Availability Calendar < 1.2.2 - Authenticated Stored Cross-Site Scripting

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-09-20 · updated 2026-06-17
• Weakness: CWE-79

Description

The Availability Calendar WordPress plugin before 1.2.2 does not sanitise or escape its Category Names before outputting them in page/post where the associated shortcode is embed, allowing high privilege users to perform Cross-Site Scripting attacks even when the unfiltered_html is disallowed

Affected products

• Availability Calendar: before 1.2.2 — fixed in 1.2.2

How to fix

Upgrade to a fixed version: Availability Calendar 1.2.2. Check the vendor advisory for mitigations.

References

• https://wpscan.com/vulnerability/d084c5b1-45f1-4e7e-b3e9-3c98ae4bce9c
• https://wpscan.com/vulnerability/d084c5b1-45f1-4e7e-b3e9-3c98ae4bce9c

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