Vulnerability · Published Mar 5, 2021 · Assigned by jpcert

CVE-2021-20663

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 0.8% (higher than 58% of all known vulnerabilities).

Severity (CVSS NVD)6.1Medium

Exploit odds (30 days)0.8%top 42.0% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
Six Apart Ltd.	Movable Type	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

References

https://jvn.jp/en/jp/JVN66542874/index.html x_refsource_MISC
https://movabletype.org/news/2021/02/mt-760-676-released.html x_refsource_MISC