CVE-2018-5974: SQL Injection exists in the SimpleCalendar 3.1.9 component for Joomla! via the catid array parameter.

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2018-5974 is a critical-severity flaw (CVSS 9.8) affecting simplecalendar. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

SQL Injection exists in the SimpleCalendar 3.1.9 component for Joomla! via the catid array parameter.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.7% (top 14%)
CISA exploited list	No
Weakness	CWE-89
Published	2018-02-17
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: albonico

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

Am I affected?

Timeline

2018-02-17 07:29 UTCPublished CVE record published
2026-06-17 02:01 UTCUpdated Record last modified

albonico simplecalendar DOWNGRADE

Affected: 3.1.9

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.1.9

1. Check installed version

apt-cache policy simplecalendar || rpm -q simplecalendar || simplecalendar --version

2. No fixed release: DOWNGRADE to a release before 3.1.9 (Debian / Ubuntu)

apt-cache madison simplecalendar sudo apt install simplecalendar=<VERSION_BEFORE_3.1.9> sudo apt-mark hold simplecalendar

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list simplecalendar sudo dnf downgrade simplecalendar-<VERSION_BEFORE_3.1.9> sudo dnf versionlock add simplecalendar

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: Joomla! Component SimpleCalendar 3.1.9 - SQL Injection

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-2018-5974?

simplecalendar: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-5974 being exploited?

CVE-2018-5974 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-2018-5974 affect?

CVE-2018-5974 affects simplecalendar. Severity is critical (CVSS 9.8). SQL Injection exists in the SimpleCalendar 3.1.9 component for Joomla! via the catid array parameter.

How urgent is CVE-2018-5974?

Priority 66/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Joomla vulnerabilities

References

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