What’s Vulnerable › Vulnerabilities

CVE-2021-24555: Diary & Availability Calendar <= 1.0.3 - Authenticated (subscriber+) SQL Injection

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-08-23 · updated 2026-06-17
• Weakness: CWE-89

Description

The daac_delete_booking_callback function, hooked to the daac_delete_booking AJAX action, takes the id POST parameter which is passed into the SQL statement without proper sanitisation, validation or escaping, leading to a SQL Injection issue. Furthermore, the ajax action is lacking any CSRF and capability check, making it available to any authenticated user.

Affected products

• Diary & Availability Calendar: through 1.0.3

References

• https://codevigilant.com/disclosure/2021/wp-plugin-diary-availability-calendar/
• https://wpscan.com/vulnerability/8eafd84b-6214-450b-869b-0afe7cca4c5f
• https://codevigilant.com/disclosure/2021/wp-plugin-diary-availability-calendar/
• https://wpscan.com/vulnerability/8eafd84b-6214-450b-869b-0afe7cca4c5f

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