CVE-2018-20756 MODX Revolution allows XSS via document resources

What is CVE-2018-20756?

CVE-2018-20756 is a medium-severity cross-site scripting vulnerability in n/a, published on 6 Feb 2019. 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

MODX Revolution through v2.7.0-pl allows XSS via a document resource (such as pagetitle), which is mishandled during an Update action, a Quick Edit action, or the viewing of manager logs.

Weakness: CWE-79

Which versions are affected by CVE-2018-20756?

2 open source packages ship an affected version, including modx/revolution. It affects 1 product.

Products include Modx Modx Revolution.

How do I fix CVE-2018-20756?

Upgrade modx/revolution to 2.7.1-pl or later.

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-2018-20756 being exploited?

There is no known exploitation of CVE-2018-20756 in the wild and no public exploit code.

Other vulnerabilities in n/a

• CVE-2017-7321 Code injection in n/a Critical 9.8
• CVE-2017-7324 Code injection in n/a Critical 9.8
• CVE-2020-25911 XML External Entity vulnerability in MODX CMS Critical 9.1
• CVE-2017-9069 MODX Revolution allows overwriting .htaccess High 8.8
• CVE-2017-7322 Weak cryptography in n/a High 8.1

Sources

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

Also known as GHSA-fpxg-5x79-43rm.