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CVE-2021-20663

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-03-05 · updated 2026-06-17
• Weakness: CWE-79

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

• Movabletype Movable Type: through 6.7.5; from 7.0000 through 7.4705
• Movabletype Movable Type Advanced: through 7.4705
• Movabletype Movable Type Premium: through 1.39
• Movabletype Movable Type Premium Advanced: through 1.39

References

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

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