CVE-2021-20664 Cross-site scripting in Movable Type
Remote attackers can inject arbitrary scripts into the Asset registration screen of Movable Type, potentially compromising user sessions or executing malicious code.
- 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-2021-20664?
CVE-2021-20664 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 Asset registration 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-2021-20664?
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-2021-20664?
No fix has been published for CVE-2021-20664 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-2021-20664 being exploited?
There is no known exploitation of CVE-2021-20664 in the wild and no public exploit code.
Other vulnerabilities in Six Apart Ltd. Movable Type
Sources
Also known as GHSA-pww3-vwvw-q638.