# CVE-2021-27781: HCL BigFix Mobile / Modern Client Management is vulnerable to stored cross-site scripting

> A stored cross-site scripting vulnerability allows attackers to inject scripts that can steal cookies or session data from users of HCL BigFix Mobile.

- **Severity:** Medium 6.6 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 27 May 2022
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-2r44-78ff-wqc3

## What is CVE-2021-27781?

CVE-2021-27781 is a medium-severity cross-site scripting vulnerability in HCL BigFix Mobile / Modern Client Management, published on 27 May 2022. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

The Master operator may be able to embed script tag in HTML with alert pop-up display cookie.

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

## Which versions are affected by CVE-2021-27781?

It affects 2 products.


Products: Hcltech Bigfix Mobile, Hcltech Modern Client Management.

## How do I fix CVE-2021-27781?

No fix has been published for CVE-2021-27781 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-27781 being exploited?

There is no known exploitation of CVE-2021-27781 in the wild and no public exploit code.

## Other vulnerabilities in HCL BigFix Mobile / Modern Client Management

- [CVE-2021-27783](https://insights.sbomify.com/CVE-2021-27783/): HCL BigFix Mobile / Modern Client Management is vulnerable to sensitive information exposure (medium 6.8)
- [CVE-2023-28014](https://insights.sbomify.com/CVE-2023-28014/): HCL BigFix Mobile can be affected by a cross-site scripting (XSS) vulnerability (medium 6.6)
- [CVE-2025-0276](https://insights.sbomify.com/CVE-2025-0276/): HCL BigFix Modern Client Management (MCM) is affected by an insecure Content Security Policy (CSP) (medium 6.5)
- [CVE-2025-0277](https://insights.sbomify.com/CVE-2025-0277/): HCL BigFix Mobile is affected by an insecure Content Security Policy (CSP) (medium 6.5)
- [CVE-2023-28012](https://insights.sbomify.com/CVE-2023-28012/): HCL BigFix Mobile can be affected by a command injection vulnerability (medium 5.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-27781 and fix it if it is affected.

What it is: CVE-2021-27781 is a medium-severity cross-site scripting vulnerability in HCL BigFix Mobile / Modern Client Management, published on 27 May 2022. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-27781 in the wild and no public exploit code.

Affected product: HCL BigFix Mobile / Modern Client Management. 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-2021-27781/ (Markdown: https://insights.sbomify.com/CVE-2021-27781/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-27781
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-27781
- OSV: https://osv.dev/vulnerability/CVE-2021-27781

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-27781/
Summaries are generated and may contain mistakes; the official description above is the record.