# CVE-2021-21445: Cross-site scripting in SAP Commerce Cloud

> An authenticated attacker can inject malicious data into HTTP response headers, leading to cross-site scripting and page hijacking in SAP Commerce Cloud.

- **Severity:** Medium 5.4 (`CVSS:3.0/AV:N/AC:L/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:** No
- **Published:** 12 Jan 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-w4g5-mcc7-3767

## What is CVE-2021-21445?

CVE-2021-21445 is a medium-severity cross-site scripting vulnerability in SAP Commerce Cloud, published on 12 Jan 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

SAP Commerce Cloud, versions - 1808, 1811, 1905, 2005, 2011, allows an authenticated attacker to include invalidated data in the HTTP response Content Type header, due to improper input validation, and sent to a Web user. A successful exploitation of this vulnerability may lead to advanced attacks, including cross-site scripting and page hijacking.

Weakness: CWE-444 (Inconsistent Interpretation of HTTP Requests)

## Which versions are affected by CVE-2021-21445?

It affects 1 product.


Products: Sap Commerce Cloud.

## How do I fix CVE-2021-21445?

No fix has been published for CVE-2021-21445 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-21445 being exploited?

There is no known exploitation of CVE-2021-21445 in the wild and no public exploit code.

## Other vulnerabilities in SAP Commerce Cloud

- [CVE-2019-0344](https://insights.sbomify.com/CVE-2019-0344/): SAP Commerce Cloud Deserialization of Untrusted Data (critical 9.8, exploited in the wild)
- [CVE-2020-6238](https://insights.sbomify.com/CVE-2020-6238/): XML external entity in SAP Commerce (critical 9.3)
- [CVE-2023-39439](https://insights.sbomify.com/CVE-2023-39439/): SAP Commerce accepts empty passphrases. (high 8.8)
- [CVE-2019-0343](https://insights.sbomify.com/CVE-2019-0343/): Code injection in SAP Commerce Cloud (Mediaconversion Extension) (high 8.8)
- [CVE-2023-42481](https://insights.sbomify.com/CVE-2023-42481/): Improper Access Control vulnerability in SAP Commerce Cloud (high 8.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-21445 and fix it if it is affected.

What it is: CVE-2021-21445 is a medium-severity cross-site scripting vulnerability in SAP Commerce Cloud, published on 12 Jan 2021. 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-2021-21445 in the wild and no public exploit code.

Affected product: SAP Commerce Cloud. 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-2021-21445/ (Markdown: https://insights.sbomify.com/CVE-2021-21445/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-21445
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-21445
- OSV: https://osv.dev/vulnerability/CVE-2021-21445

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-21445/
Summaries are generated and may contain mistakes; the official description above is the record.