# CVE-2021-20842: EC-CUBE Cross-site request forgery (CSRF) vulnerability

> A CSRF vulnerability in EC-CUBE allows attackers to hijack administrator sessions and delete admin accounts via crafted web pages.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/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:** Yes
- **Published:** 24 Nov 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-m9hv-qmqh-33qh

## What is CVE-2021-20842?

CVE-2021-20842 is a medium-severity vulnerability in EC-CUBE 2 series, published on 24 Nov 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 request forgery (CSRF) vulnerability in EC-CUBE 2 series 2.11.0 to 2.17.1 allows a remote attacker to hijack the authentication of Administrator and delete Administrator via a specially crafted web page.

Weakness: CWE-352 (Cross-Site Request Forgery)

## Which versions are affected by CVE-2021-20842?

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 2.11.0 | 2.17.2 |
| `ec-cube/ec-cube` | Packagist | From 2.11.0 | 2.17.2 |

Products: Ec-Cube Ec-Cube.

## How do I fix CVE-2021-20842?

Upgrade ec-cube/ec-cube to 2.17.2 or later.

## Is CVE-2021-20842 being exploited?

There is no known exploitation of CVE-2021-20842 in the wild and no public exploit code.

## Other vulnerabilities in EC-CUBE 2 series

- [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-2021-20842 and fix it if it is affected.

What it is: CVE-2021-20842 is a medium-severity vulnerability in EC-CUBE 2 series, published on 24 Nov 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-2021-20842 in the wild and no public exploit code.

Affected packages and fixed versions:
- ec-cube/ec-cube (Packagist): affected from 2.11.0; fixed in 2.17.2
- ec-cube/ec-cube (Packagist): affected from 2.11.0; fixed in 2.17.2

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-2021-20842/ (Markdown: https://insights.sbomify.com/CVE-2021-20842/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-20842
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-20842
- OSV: https://osv.dev/vulnerability/CVE-2021-20842

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-20842/
Summaries are generated and may contain mistakes; the official description above is the record.