CVE-2021-24555: The daac_delete_booking_callback function, hooked to the daac_delete_booking AJAX action, takes the id POST pa

Q: How do I fix CVE-2021-24555?

diary-availability-calendar: upgrade to newer than 1.0.3. Exact commands for each OS are on this page.

Q: Is CVE-2021-24555 being exploited?

CVE-2021-24555 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-24555 affect?

CVE-2021-24555 affects diary-availability-calendar. Severity is high (CVSS 8.8). 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 iss

Q: How urgent is CVE-2021-24555?

Priority 50/100. High severity; Public exploit reference

This month

HIGH 8.8UPGRADE

CVE-2021-24555 is a high-severity flaw (CVSS 8.8) affecting diary-availability-calendar. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.8% (top 43%)
CISA exploited list	No
Weakness	CWE-89, CWE-352
Published	2021-08-23
Last modified	2026-06-17

Publisher (CNA): WPScan · Vendor: roosty

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-08-23 12:15 UTCPublished CVE record published
2026-06-17 03:40 UTCUpdated Record last modified

roosty diary-availability-calendar UPGRADE

Affected: <= 1.0.3

Fixed in: newer than 1.0.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy diary-availability-calendar || rpm -q diary-availability-calendar || diary-availability-calendar --version

2. UPGRADE to newer than 1.0.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade diary-availability-calendar

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade diary-availability-calendar

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-24555?

diary-availability-calendar: upgrade to newer than 1.0.3. Exact commands for each OS are on this page.

Is CVE-2021-24555 being exploited?

CVE-2021-24555 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-24555 affect?

CVE-2021-24555 affects diary-availability-calendar. Severity is high (CVSS 8.8). 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 iss

How urgent is CVE-2021-24555?

Priority 50/100. High severity; Public exploit reference

References

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