CVE-2021-20663 Cross-site scripting in Movable Type
Remote attackers can inject arbitrary scripts into the Role authority setting screen of Movable Type, 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-2021-20663?
CVE-2021-20663 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 Role authority setting screen 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 6.7.5 and earlier (Movable Type 6.7 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-2021-20663?
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-2021-20663?
No fix has been published for CVE-2021-20663 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-2021-20663 being exploited?
There is no known exploitation of CVE-2021-20663 in the wild and no public exploit code.
Other vulnerabilities in Six Apart Ltd. Movable Type
Sources
Also known as GHSA-5hv6-7w3w-8wmj.