# CVE-2021-23824: Content Injection

> Attackers can inject malicious scripts via unquoted template attributes, leading to Cross-site Scripting and potential code execution.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Jan 2022
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-phvc-ghwf-mr3q, SNYK-UNMANAGED-CROW-2336164

## What is CVE-2021-23824?

CVE-2021-23824 is a medium-severity cross-site scripting vulnerability in Crow, published on 13 Jan 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

This affects the package Crow before 0.3+4. When using attributes without quotes in the template, an attacker can manipulate the input to introduce additional attributes, potentially executing code. This may lead to a Cross-site Scripting (XSS) vulnerability, assuming an attacker can influence the value entered into the template. If the template is used to render user-generated content, this vulnerability may escalate to a persistent XSS vulnerability.

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

## Which versions are affected by CVE-2021-23824?

It affects 1 product.


Products: Crowcpp Crow.

## How do I fix CVE-2021-23824?

No fix has been published for CVE-2021-23824 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-23824 being exploited?

There is no known exploitation of CVE-2021-23824 in the wild and no public exploit code.

## Other vulnerabilities in Crow

- [CVE-2022-38667](https://insights.sbomify.com/CVE-2022-38667/): Use after free in n/a (critical 9.8)
- [CVE-2022-34970](https://insights.sbomify.com/CVE-2022-34970/): Memory corruption in n/a (critical 9.8)
- [CVE-2022-38668](https://insights.sbomify.com/CVE-2022-38668/): Information disclosure in n/a (high 7.5)
- [CVE-2023-26142](https://insights.sbomify.com/CVE-2023-26142/): Other in Crow (medium 6.5)
- [CVE-2021-23514](https://insights.sbomify.com/CVE-2021-23514/): Path Traversal (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-23824 and fix it if it is affected.

What it is: CVE-2021-23824 is a medium-severity cross-site scripting vulnerability in Crow, published on 13 Jan 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-23824 in the wild and no public exploit code.

Affected product: Crow. 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-2021-23824/ (Markdown: https://insights.sbomify.com/CVE-2021-23824/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-23824
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-23824
- OSV: https://osv.dev/vulnerability/CVE-2021-23824

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-23824/
Summaries are generated and may contain mistakes; the official description above is the record.