# CVE-2020-5220: Ability to expose data in Sylius by using an unintended serialisation group

> Attackers can expose sensitive data by manipulating HTTP headers to use unintended serialization groups in Sylius ResourceBundle APIs.

- **Severity:** Medium 4.4 (`CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 27 Jan 2020
- **Updated:** 4 Aug 2024

## What is CVE-2020-5220?

CVE-2020-5220 is a medium-severity vulnerability in SyliusResourceBundle, published on 27 Jan 2020. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

Sylius ResourceBundle accepts and uses any serialisation groups to be passed via a HTTP header. This might lead to data exposure by using an unintended serialisation group - for example it could make Shop API use a more permissive group from Admin API. Anyone exposing an API with ResourceBundle's controller is affected. The vulnerable versions are: <1.3 || >=1.3.0 <=1.3.12 || >=1.4.0 <=1.4.5 || >=1.5.0 <=1.5.0 || >=1.6.0 <=1.6.2. The patch is provided for Sylius ResourceBundle 1.3.13, 1.4.6, 1.5.1 and 1.6.3, but not for any versions below 1.3.

Weakness: CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor), CWE-444 (Inconsistent Interpretation of HTTP Requests)

## Which versions are affected by CVE-2020-5220?

It affects 1 product.


Products: Sylius Syliusresourcebundle.

## How do I fix CVE-2020-5220?

Apply the vendor's patch.

## Is CVE-2020-5220 being exploited?

There is no known exploitation of CVE-2020-5220 in the wild and no public exploit code.

## Other vulnerabilities in SyliusResourceBundle

- [CVE-2020-15146](https://insights.sbomify.com/CVE-2020-15146/): Remote Code Execution in SyliusResourceBundle (critical 9.6)
- [CVE-2020-15143](https://insights.sbomify.com/CVE-2020-15143/): Remote Code Execution in SyliusResourceBundle (high 7.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-5220 and fix it if it is affected.

What it is: CVE-2020-5220 is a medium-severity vulnerability in SyliusResourceBundle, published on 27 Jan 2020. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2020-5220 in the wild and no public exploit code.

Affected product: SyliusResourceBundle. 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-2020-5220/ (Markdown: https://insights.sbomify.com/CVE-2020-5220/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-5220
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-5220
- OSV: https://osv.dev/vulnerability/CVE-2020-5220

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-5220/
Summaries are generated and may contain mistakes; the official description above is the record.