CVE-2016-1000271: Joomla extension DT Register version before 3.1.12 (Joomla 3.x) / 2.8.18 (Joomla 2.5) contains an SQL injectio

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2016-1000271 is a critical-severity flaw (CVSS 9.8) affecting dt register. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Joomla extension DT Register version before 3.1.12 (Joomla 3.x) / 2.8.18 (Joomla 2.5) contains an SQL injection in "/index.php?controller=calendar&format=raw&cat[0]=SQLi&task=events". This attack appears to be exploitable if the attacker can reach the web server.

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.0% (top 20%)
CISA exploited list	No
Weakness	CWE-89
Published	2019-02-04
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: dthdevelopment

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

Am I affected?

Timeline

2019-02-04 21:29 UTCPublished CVE record published
2026-06-17 00:38 UTCUpdated Record last modified

dthdevelopment dt register UPGRADE

Affected: >= 2.0.0 and < 2.8.18 · >= 3.0.0 and < 3.1.12

Fixed in: 2.8.18, 3.1.12

Safe to downgrade to: a release before 2.0.0

1. Check installed version

apt-cache policy dt-register || rpm -q dt-register || dt-register --version

2. UPGRADE to 2.8.18 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade dt-register

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade dt-register

Note

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

3. If no update is available yet, DOWNGRADE to a release before 2.0.0 (Debian / Ubuntu)

apt-cache madison dt-register sudo apt install dt-register=<VERSION_BEFORE_2.0.0> sudo apt-mark hold dt-register

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list dt-register sudo dnf downgrade dt-register-<VERSION_BEFORE_2.0.0> sudo dnf versionlock add dt-register

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.

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-2016-1000271?

dt register: upgrade to 2.8.18, 3.1.12. Exact commands for each OS are on this page.

Is CVE-2016-1000271 being exploited?

CVE-2016-1000271 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-2016-1000271 affect?

CVE-2016-1000271 affects dt register. Severity is critical (CVSS 9.8). Joomla extension DT Register version before 3.1.12 (Joomla 3.x) / 2.8.18 (Joomla 2.5) contains an SQL injection in "/index.php?controller=calendar&format=raw&cat[0]=SQLi&task=events". This attack appears to be exploitable if the attacker ca

How urgent is CVE-2016-1000271?

Priority 64/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Joomla vulnerabilities · PHP vulnerabilities

Related CVEs

CVE-2018-6584 CRITICAL 9.8 DOWNGRADE SQL Injection exists in the DT Register 3.2.7 component for Joomla! via a task=edit&id= request.

References

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