Vulnerability · Published Aug 26, 2021 · Assigned by jpcert

CVE-2021-20811

Medium 6.1

In plain English

A medium-severity security flaw in Movable Type from Six Apart Ltd.. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 60% of all known vulnerabilities).

Severity (CVSS NVD)6.1Medium

Exploit odds (30 days)0.9%top 40.2% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

Cross-site scripting vulnerability in List of Assets screen of Movable Type (Movable Type 7 r.4903 and earlier (Movable Type 7 Series), Movable Type 6.8.0 and earlier (Movable Type 6 Series), Movable Type Advanced 7 r.4903 and earlier (Movable Type Advanced 7 Series), Movable Type Premium 1.44 and earlier, and Movable Type Premium Advanced 1.44 and earlier) allows remote attackers to inject arbitrary script or HTML via unspecified vectors.

Affected products (as reported)

Vendor	Product	Versions
Six Apart Ltd.	Movable Type	Movable Type 7 r.4903 and earlier (Movable Type 7 Series), Movable Type 6.8.0 and earlier (Movable Type 6 Series), Movable Type Advanced 7 r.4903 and earlier (Movable Type Advanced 7 Series), Movable Type Premium 1.44 and earlier, and Movable Type Premium Advanced 1.44 and earlier

References

https://movabletype.org/news/2021/08/mt-780-681-released.html x_refsource_MISC
https://jvn.jp/en/jp/JVN97545738/index.html x_refsource_MISC