What is CVE-2021-20815?

CVE-2021-20815 is a cross-site scripting vulnerability in the Edit Boilerplate screen of Movable Type.

What is the severity of CVE-2021-20815?

The severity of CVE-2021-20815 is medium with a CVSS score of 6.1.

How can I fix CVE-2021-20815?

To fix CVE-2021-20815, upgrade to Movable Type 7.8.0 or Movable Type 6.8.1.

Where can I find more information about CVE-2021-20815?

You can find more information about CVE-2021-20815 at the following references: [JVN website](https://jvn.jp/en/jp/JVN97545738/index.html) and [Movable Type news](https://movabletype.org/news/2021/08/mt-780-681-released.html).

Vulnerability/
CVE-2021-20815

medium

6.1

CWE

26/8/2021

3/8/2024

CVE-2021-20815: XSS

Q: Which software versions are affected by CVE-2021-20815?

CVE-2021-20815 affects 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), and Movable Type Premium 1.44 and earlier.

First published: Thu Aug 26 2021(Updated: )

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.

Credit: vultures@jpcert.or.jp

Affected Software	Affected Version	How to fix
Sixapart Movable Type	<=1.44
Sixapart Movable Type	<=1.44
Sixapart Movable Type	>=6.0<=6.8.0
Sixapart Movable Type	>=7.0<7.8.0
Sixapart Movable Type	>=7.0<7.8.0

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Frequently Asked Questions

What is CVE-2021-20815?
CVE-2021-20815 is a cross-site scripting vulnerability in the Edit Boilerplate screen of Movable Type.
What is the severity of CVE-2021-20815?
The severity of CVE-2021-20815 is medium with a CVSS score of 6.1.
Which software versions are affected by CVE-2021-20815?
CVE-2021-20815 affects 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), and Movable Type Premium 1.44 and earlier.
How can I fix CVE-2021-20815?
To fix CVE-2021-20815, upgrade to Movable Type 7.8.0 or Movable Type 6.8.1.
Where can I find more information about CVE-2021-20815?
You can find more information about CVE-2021-20815 at the following references: [JVN website](https://jvn.jp/en/jp/JVN97545738/index.html) and [Movable Type news](https://movabletype.org/news/2021/08/mt-780-681-released.html).

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agent/weakness
agent/references
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agent/type
agent/event
agent/softwarecombine
agent/first-publish-date
agent/tags
agent/last-modified-date
collector/mitre-cve
source/MITRE
vendor/sixapart
canonical/sixapart movable type
version/sixapart movable type/1.44
version/sixapart movable type/6.0
version/sixapart movable type/6.8.0
version/sixapart movable type/7.0

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