# CVE-2021-20717: EC-CUBE Cross-site scripting vulnerability

> Remote attackers can inject scripts into EC-CUBE input fields, leading to arbitrary script execution in administrators' browsers.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 10 May 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-c8mx-43cq-993w

## What is CVE-2021-20717?

CVE-2021-20717 is a medium-severity cross-site scripting vulnerability in EC-CUBE, published on 10 May 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Cross-site scripting vulnerability in EC-CUBE 4.0.0 to 4.0.5 allows a remote attacker to inject a specially crafted script in the specific input field of the EC web site which is created using EC-CUBE. As a result, it may lead to an arbitrary script execution on the administrator's web browser.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2021-20717?

2 open source packages ship an affected version, including ec-cube/ec-cube. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `ec-cube/ec-cube` | Packagist | From 4.0.0 to 4.0.5 | None |
| `ec-cube/ec-cube` | Packagist | From 4.0.0 to 4.0.5 | None |

Products: Ec-Cube Ec-Cube.

## How do I fix CVE-2021-20717?

No fix has been published for CVE-2021-20717 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-20717 being exploited?

There is no known exploitation of CVE-2021-20717 in the wild and no public exploit code.

Public exploit code:

- CVE-2021-20717-EC-CUBE-XSS (github_poc): https://github.com/s-index/CVE-2021-20717

## Other vulnerabilities in EC-CUBE

- [CVE-2020-5590](https://insights.sbomify.com/CVE-2020-5590/): EC-CUBE Directory traversal vulnerability (high 8.1)
- [CVE-2021-20778](https://insights.sbomify.com/CVE-2021-20778/): Missing authorization in EC-CUBE (high 7.5)
- [CVE-2020-5680](https://insights.sbomify.com/CVE-2020-5680/): EC-CUBE Improper input validation vulnerability (high 7.5)
- [CVE-2008-4991](https://insights.sbomify.com/CVE-2008-4991/): SQL injection in n/a (high 7.5)
- [CVE-2008-4534](https://insights.sbomify.com/CVE-2008-4534/): SQL injection in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-20717 and fix it if it is affected.

What it is: CVE-2021-20717 is a medium-severity cross-site scripting vulnerability in EC-CUBE, published on 10 May 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-20717 in the wild and no public exploit code.

Affected packages and fixed versions:
- ec-cube/ec-cube (Packagist): affected from 4.0.0 up to 4.0.5; no fix listed
- ec-cube/ec-cube (Packagist): affected from 4.0.0 up to 4.0.5; no fix listed

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-2021-20717/ (Markdown: https://insights.sbomify.com/CVE-2021-20717/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-20717
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-20717
- OSV: https://osv.dev/vulnerability/CVE-2021-20717

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-20717/
Summaries are generated and may contain mistakes; the official description above is the record.