CVE-2021-24553: The Timeline Calendar WordPress plugin through 1.2 does not sanitise, validate or escape the edit GET paramete

Q: How do I fix CVE-2021-24553?

timeline calendar: upgrade to newer than 1.2. Exact commands for each OS are on this page.

Q: Is CVE-2021-24553 being exploited?

CVE-2021-24553 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-2021-24553 affect?

CVE-2021-24553 affects timeline calendar. Severity is high (CVSS 7.2). The Timeline Calendar WordPress plugin through 1.2 does not sanitise, validate or escape the edit GET parameter before using it in a SQL statement when editing events, leading to an authenticated SQL injection issue. Other SQL Injections ar

Q: How urgent is CVE-2021-24553?

Priority 49/100. High severity; Public exploit reference

This month

HIGH 7.2UPGRADE

CVE-2021-24553 is a high-severity flaw (CVSS 7.2) affecting timeline calendar. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Timeline Calendar WordPress plugin through 1.2 does not sanitise, validate or escape the edit GET parameter before using it in a SQL statement when editing events, leading to an authenticated SQL injection issue. Other SQL Injections are also present in the plugin

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: timeline 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

timeline calendar project timeline calendar UPGRADE

Affected: <= 1.2

Fixed in: newer than 1.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy timeline-calendar || rpm -q timeline-calendar || timeline-calendar --version

2. UPGRADE to newer than 1.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade timeline-calendar

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade timeline-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-2021-24553?

timeline calendar: upgrade to newer than 1.2. Exact commands for each OS are on this page.

Is CVE-2021-24553 being exploited?

CVE-2021-24553 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-2021-24553 affect?

CVE-2021-24553 affects timeline calendar. Severity is high (CVSS 7.2). The Timeline Calendar WordPress plugin through 1.2 does not sanitise, validate or escape the edit GET parameter before using it in a SQL statement when editing events, leading to an authenticated SQL injection issue. Other SQL Injections ar

How urgent is CVE-2021-24553?

Priority 49/100. High severity; Public exploit reference

Software pages

WordPress vulnerabilities

References

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