# CVE-2021-29267: Cross-site scripting in n/a

> Cross-site scripting in SherlockIM allows attackers to target help-desk staff via the chatbot attachment feature.

- **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:** 29 Mar 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-w2xw-7qr5-2f7j

## What is CVE-2021-29267?

CVE-2021-29267 is a medium-severity cross-site scripting vulnerability in n/a, published on 29 Mar 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

Sherlock SherlockIM through 2021-03-29 allows Cross Site Scripting (XSS) by leveraging the api/Files/Attachment URI to attack help-desk staff via the chatbot feature.

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

## Which versions are affected by CVE-2021-29267?

It affects 1 product.


Products: Sherlockim Sherlockim.

## How do I fix CVE-2021-29267?

No fix has been published for CVE-2021-29267 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-29267 being exploited?

There is no known exploitation of CVE-2021-29267 in the wild and no public exploit code.

Public exploit code:

- SherlockIM ChatBot XSS (github_poc): https://github.com/Security-AVS/CVE-2021-29267

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-29267 and fix it if it is affected.

What it is: CVE-2021-29267 is a medium-severity cross-site scripting vulnerability in n/a, published on 29 Mar 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-2021-29267 in the wild and no public exploit code.

Affected product: n/a. 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-2021-29267/ (Markdown: https://insights.sbomify.com/CVE-2021-29267/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-29267
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-29267
- OSV: https://osv.dev/vulnerability/CVE-2021-29267

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-29267/
Summaries are generated and may contain mistakes; the official description above is the record.