CVE-2020-5528 Cross-site scripting in Movable Type series

Medium 6.1 Published 6 Feb 2020 Updated 4 Aug 2024

Remote attackers can inject arbitrary web script or HTML into the block and rich text editors via crafted URLs, potentially compromising user sessions.

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-2020-5528?

CVE-2020-5528 is a medium-severity cross-site scripting vulnerability in Six Apart Ltd Movable Type series, published on 6 Feb 2020. 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

Cross-site scripting vulnerability in Movable Type series (Movable Type 7 r.4603 and earlier (Movable Type 7), Movable Type 6.5.2 and earlier (Movable Type 6.5), Movable Type Advanced 7 r.4603 and earlier (Movable Type Advanced 7), Movable Type Advanced 6.5.2 and earlier (Movable Type Advanced 6.5), Movable Type Premium 1.26 and earlier (Movable Type Premium), and Movable Type Premium Advanced 1.26 and earlier (Movable Type Premium Advanced)) allows remote attackers to inject arbitrary web script or HTML in the block editor and the rich text editor via a specially crafted URL.

Weakness: CWE-79

Which versions are affected by CVE-2020-5528?

It affects 1 product.

Products include Sixapart Movable Type.

How do I fix CVE-2020-5528?

No fix has been published for CVE-2020-5528 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-2020-5528 being exploited?

There is no known exploitation of CVE-2020-5528 in the wild and no public exploit code.

Sources

Also known as GHSA-5928-fcw8-m7f4.