CVE-2020-5669 Cross-site scripting in Movable Type

Medium 5.4 Published 26 Oct 2021 Updated 4 Aug 2024

Remote authenticated attackers can inject arbitrary scripts into Movable Type Premium, potentially leading to code execution or account takeover.

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

What is CVE-2020-5669?

CVE-2020-5669 is a medium-severity cross-site scripting vulnerability in Six Apart Ltd. Movable Type, published on 26 Oct 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

Cross-site scripting vulnerability in Movable Type Movable Type Premium 1.37 and earlier and Movable Type Premium Advanced 1.37 and earlier allows a remote authenticated attacker to inject an arbitrary script via unspecified vectors.

Weakness: CWE-79

Which versions are affected by CVE-2020-5669?

It affects 1 product.

Products include Sixapart Movable Type.

How do I fix CVE-2020-5669?

No fix has been published for CVE-2020-5669 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-2020-5669 being exploited?

There is no known exploitation of CVE-2020-5669 in the wild and no public exploit code.

Sources

Also known as GHSA-3x6m-pmx9-j7f5.