CVE-2019-14827 Cross-site scripting in Moodle

Medium 6.1 Published 17 May 2021 Updated 5 Aug 2024

Attackers can inject JavaScript into Moodle Mustache templates via recursive rendering, potentially leading to script execution and account compromise.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2019-14827?

CVE-2019-14827 is a medium-severity cross-site scripting vulnerability in Moodle Moodle, published on 17 May 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

A vulnerability was found in Moodle where javaScript injection was possible in some Mustache templates via recursive rendering from contexts. Mustache helper tags that were included in template contexts were not being escaped before that context was injected into another Mustache helper, which could result in script injection in some templates. This affects versions 3.7 to 3.7.1, 3.6 to 3.6.5, 3.5 to 3.5.7 and earlier unsupported versions.

Weakness: CWE-94

Which versions are affected by CVE-2019-14827?

It affects 1 product.

Products include Moodle Moodle.

How do I fix CVE-2019-14827?

No fix has been published for CVE-2019-14827 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2019-14827 being exploited?

There is no known exploitation of CVE-2019-14827 in the wild and no public exploit code.

All Moodle Moodle vulnerabilities

Sources

Also known as CVE-2018-1138, GHSA-9r7q-rgxm-f2hm, UBUNTU-CVE-2019-14827.