CVE-2021-20815

MediumCVSS 6.1/10Last modified Jun 17, 2026

Description

Cross-site scripting vulnerability in Edit Boilerplate 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.

Metrics

CVSS 3.1 6.1/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Weakness enumeration

CWE-79

Affected software

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://jvn.jp/en/jp/JVN97545738/index.htmlThird Party Advisory
https://movabletype.org/news/2021/08/mt-780-681-released.htmlRelease Notes, Vendor Advisory
https://jvn.jp/en/jp/JVN97545738/index.htmlThird Party Advisory
https://movabletype.org/news/2021/08/mt-780-681-released.htmlRelease Notes, Vendor Advisory

Timeline

Published: Aug 26, 2021
Last modified: Jun 17, 2026
NVD status: Modified

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