CVE-2021-20815

moderate-risk
Published 2021-08-26

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.

Do I need to act?

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0.35% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
6
CVSS 6.1/10 Medium
NETWORK / LOW complexity

Affected Products (4)

Affected Vendors

Sixapart

References (4)

Third Party Advisory https://jvn.jp/en/jp/JVN97545738/index.html
Release Notes https://movabletype.org/news/2021/08/mt-780-681-released.html
Third Party Advisory https://jvn.jp/en/jp/JVN97545738/index.html
Release Notes https://movabletype.org/news/2021/08/mt-780-681-released.html
34
/ 100
moderate-risk
Severity 23/34 · High
Exploitability 1/34 · Minimal
Exposure 10/34 · Low