# CVE-2020-5577: File upload in Movable Type

> Remote authenticated attackers can upload arbitrary files to execute PHP scripts, leading to code execution on Movable Type CMS installations.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 14 May 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-qq4g-m927-9x4x

## What is CVE-2020-5577?

CVE-2020-5577 is a high-severity vulnerability in Six Apart Ltd. Movable Type, published on 14 May 2020. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Movable Type series (Movable Type 7 r.4606 (7.2.1) and earlier (Movable Type 7), Movable Type Advanced 7 r.4606 (7.2.1) and earlier (Movable Type Advanced 7), Movable Type for AWS 7 r.4606 (7.2.1) and earlier (Movable Type for AWS 7), Movable Type 6.5.3 and earlier (Movable Type 6.5), Movable Type Advanced 6.5.3 and earlier (Movable Type Advanced 6.5), Movable Type 6.3.11 and earlier (Movable Type 6.3), Movable Type Advanced 6.3.11 and earlier (Movable Type 6.3), Movable Type Premium 1.29 and earlier, and Movable Type Premium Advanced 1.29 and earlier) allow remote authenticated attackers to upload arbitrary files and execute a php script via unspecified vectors.

Weakness: CWE-434 (Unrestricted Upload of File with Dangerous Type)

## Which versions are affected by CVE-2020-5577?

It affects 1 product.


Products: Sixapart Movable Type.

## How do I fix CVE-2020-5577?

No fix has been published for CVE-2020-5577 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-5577 being exploited?

There is no known exploitation of CVE-2020-5577 in the wild and no public exploit code.

## Other vulnerabilities in Six Apart Ltd. Movable Type

- [CVE-2009-0752](https://insights.sbomify.com/CVE-2009-0752/): Other in n/a (critical 10.0)
- [CVE-2022-38078](https://insights.sbomify.com/CVE-2022-38078/): Command injection in Movable Type XMLRPC API (critical 9.8)
- [CVE-2021-20837](https://insights.sbomify.com/CVE-2021-20837/): Command injection in Movable Type (critical 9.8)
- [CVE-2016-5742](https://insights.sbomify.com/CVE-2016-5742/): SQL injection in n/a (critical 9.8)
- [CVE-2026-25776](https://insights.sbomify.com/CVE-2026-25776/): Code injection in Movable Type (critical 9.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-5577 and fix it if it is affected.

What it is: CVE-2020-5577 is a high-severity vulnerability in Six Apart Ltd. Movable Type, published on 14 May 2020. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-5577 in the wild and no public exploit code.

Affected product: Six Apart Ltd. Movable Type. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2020-5577/ (Markdown: https://insights.sbomify.com/CVE-2020-5577/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-5577
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-5577
- OSV: https://osv.dev/vulnerability/CVE-2020-5577

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-5577/
Summaries are generated and may contain mistakes; the official description above is the record.