CVE-2021-20665 Cross-site scripting in Movable Type
Remote attackers can inject arbitrary scripts into the Movable Type CMS asset screen, potentially leading to code execution or account takeover.
- 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-2021-20665?
CVE-2021-20665 is a medium-severity cross-site scripting vulnerability in Six Apart Ltd. Movable Type, published on 5 Mar 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
Cross-site scripting vulnerability in in Add asset screen of Contents field of Movable Type 7 r.4705 and earlier (Movable Type 7 Series), Movable Type Advanced 7 r.4705 and earlier (Movable Type Advanced 7 Series), Movable Type Premium 1.39 and earlier, and Movable Type Premium Advanced 1.39 and earlier allows remote attackers to inject an arbitrary script via unspecified vectors.
Weakness: CWE-79
Which versions are affected by CVE-2021-20665?
It affects 4 products.
Products include Movabletype Movable Type, Movabletype Movable Type Advanced, Movabletype Movable Type Premium, Movabletype Movable Type Premium Advanced.
How do I fix CVE-2021-20665?
No fix has been published for CVE-2021-20665 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-2021-20665 being exploited?
There is no known exploitation of CVE-2021-20665 in the wild and no public exploit code.
Other vulnerabilities in Six Apart Ltd. Movable Type
Sources
Also known as GHSA-7ppf-q9mq-qg3g.