CVE-2016-2156 Moodle provides calendar-event data without considering whether an activity is hidden

What is CVE-2016-2156?

CVE-2016-2156 is a medium-severity vulnerability in Moodle Moodle, published on 22 May 2016. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

calendar/externallib.php in Moodle through 2.6.11, 2.7.x before 2.7.13, 2.8.x before 2.8.11, 2.9.x before 2.9.5, and 3.0.x before 3.0.3 provides calendar-event data without considering whether an activity is hidden, which allows remote authenticated users to obtain sensitive information via a web-service request.

Weakness: CWE-200

Which versions are affected by CVE-2016-2156?

8 open source packages ship an affected version, including moodle/moodle. It affects 1 product.

Products include Moodle Moodle.

How do I fix CVE-2016-2156?

Upgrade moodle/moodle to a fixed version for your release line: 2.7.13, 2.8.11, 2.9.5 or 3.0.3.

Is CVE-2016-2156 being exploited?

There is no known exploitation of CVE-2016-2156 in the wild and no public exploit code.

Other vulnerabilities in Moodle Moodle

• CVE-2006-4935 File upload in n/a Critical 10.0
• CVE-2006-4936 Moodle does not properly validate module instance id Critical 10.0
• CVE-2004-2233 Unknown "front page vulnerability with Moodle servers" for Moodle before 1.3.2 has unknown impact and attack vectors. Critical 10.0
• CVE-2004-2235 Cross-site scripting in n/a Critical 10.0
• CVE-2004-2236 Other in n/a Critical 10.0

All Moodle Moodle vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-h8vc-v44p-5r2q, UBUNTU-CVE-2016-2156.