CVE-2021-24552: The Simple Events Calendar WordPress plugin through 1.4.0 does not sanitise, validate or escape the event_id P

Q: How do I fix CVE-2021-24552?

simple events calendar: upgrade to newer than 1.4.0. Exact commands for each OS are on this page.

Q: Is CVE-2021-24552 being exploited?

CVE-2021-24552 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-2021-24552 affect?

CVE-2021-24552 affects simple events calendar. Severity is high (CVSS 7.2). The Simple Events Calendar WordPress plugin through 1.4.0 does not sanitise, validate or escape the event_id POST parameter before using it in a SQL statement when deleting events, leading to an authenticated SQL injection issue

Q: How urgent is CVE-2021-24552?

Priority 49/100. High severity; Public exploit reference

This month

HIGH 7.2UPGRADE

CVE-2021-24552 is a high-severity flaw (CVSS 7.2) affecting simple events calendar. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Simple Events Calendar WordPress plugin through 1.4.0 does not sanitise, validate or escape the event_id POST parameter before using it in a SQL statement when deleting events, leading to an authenticated SQL injection issue

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	7.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	1.6% (top 25%)
CISA exploited list	No
Weakness	CWE-89
Published	2021-08-23
Last modified	2026-06-17

Publisher (CNA): WPScan · Vendor: simple events calendar project

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

simple events calendar project simple events calendar UPGRADE

Affected: <= 1.4.0

Fixed in: newer than 1.4.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy simple-events-calendar || rpm -q simple-events-calendar || simple-events-calendar --version

2. UPGRADE to newer than 1.4.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade simple-events-calendar

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade simple-events-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-2021-24552?

simple events calendar: upgrade to newer than 1.4.0. Exact commands for each OS are on this page.

Is CVE-2021-24552 being exploited?

CVE-2021-24552 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-2021-24552 affect?

CVE-2021-24552 affects simple events calendar. Severity is high (CVSS 7.2). The Simple Events Calendar WordPress plugin through 1.4.0 does not sanitise, validate or escape the event_id POST parameter before using it in a SQL statement when deleting events, leading to an authenticated SQL injection issue

How urgent is CVE-2021-24552?

Priority 49/100. High severity; Public exploit reference

Software pages

WordPress vulnerabilities

References

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