CVE-2021-24555

Name: CVE-2021-24555
Creator: NVD / NIST
Published: 2021-08-23T12:15:09.9+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.82%

Last modified Jun 17, 2026

CVE-2021-24555 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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.. EPSS estimates a 0.82% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

0.82%

52.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Roosty	Diary-Availability-Calendar	<= 1.0.3

References

https://codevigilant.com/disclosure/2021/wp-plugin-diary-availability-calendar/Exploit, Third Party Advisory
https://wpscan.com/vulnerability/8eafd84b-6214-450b-869b-0afe7cca4c5fExploit, Third Party Advisory
https://codevigilant.com/disclosure/2021/wp-plugin-diary-availability-calendar/Exploit, Third Party Advisory
https://wpscan.com/vulnerability/8eafd84b-6214-450b-869b-0afe7cca4c5fExploit, Third Party Advisory

Timeline

Published: Aug 23, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-24555?

How severe is CVE-2021-24555?

CVE-2021-24555 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.82% probability of exploitation in the next 30 days.

How do I fix CVE-2021-24555?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-24555?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST