# CVE-2021-27786: HCL OneTest Server is vulnerable to Cross Origin Resource Sharing: Arbitrary Origin Trusted

> Misconfigured CORS allows attackers to access sensitive information and perform privileged actions via cross-origin requests.

- **Severity:** Medium 4.6 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/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:** 7 Jun 2022
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-4326-c9xj-r26f

## What is CVE-2021-27786?

CVE-2021-27786 is a medium-severity vulnerability in HCL OneTest Server, published on 7 Jun 2022. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

Cross-origin resource sharing (CORS) enables browsers to perform cross domain requests in a controlled manner. This request has an Origin header that identifies the domain that is making the initial request and defines the protocol between a browser and server to see if the request is allowed. An attacker can take advantage of this and possibly carry out privileged actions and access sensitive information when the Access-Control-Allow-Credentials is enabled.

Weakness: CWE-697 (Incorrect Comparison), CWE-942 (Permissive Cross-domain Security Policy with Untrusted Domains)

## Which versions are affected by CVE-2021-27786?

It affects 1 product.


Products: Hcltech Onetest Server.

## How do I fix CVE-2021-27786?

No fix has been published for CVE-2021-27786 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-27786 being exploited?

There is no known exploitation of CVE-2021-27786 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-27786 and fix it if it is affected.

What it is: CVE-2021-27786 is a medium-severity vulnerability in HCL OneTest Server, published on 7 Jun 2022. 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-2021-27786 in the wild and no public exploit code.

Affected product: HCL OneTest Server. 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-2021-27786/ (Markdown: https://insights.sbomify.com/CVE-2021-27786/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-27786
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-27786
- OSV: https://osv.dev/vulnerability/CVE-2021-27786

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-27786/
Summaries are generated and may contain mistakes; the official description above is the record.