# CVE-2021-28826: TIBCO Messaging - Eclipse Mosquitto Distribution - Bridge Windows Platform Installation vulnerability

> Local attackers can exploit insecure file permissions to insert malicious software and execute it with elevated privileges in TIBCO Mosquitto Bridge.

- **Severity:** High 8.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 14 Apr 2021
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-2r3q-hh42-h52v

## What is CVE-2021-28826?

CVE-2021-28826 is a high-severity vulnerability in TIBCO Messaging - Eclipse Mosquitto Distribution - Bridge - Community Edition, published on 14 Apr 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

The Windows Installation component of TIBCO Software Inc.'s TIBCO Messaging - Eclipse Mosquitto Distribution - Bridge - Community Edition and TIBCO Messaging - Eclipse Mosquitto Distribution - Bridge - Enterprise Edition contains a vulnerability that theoretically allows a low privileged attacker with local access on some versions of the Windows operating system to insert malicious software. The affected component can be abused to execute the malicious software inserted by the attacker with the elevated privileges of the component. This vulnerability results from a lack of access restrictions on certain files and/or folders in the installation. Affected releases are TIBCO Software Inc.'s TIBCO Messaging - Eclipse Mosquitto Distribution - Bridge - Community Edition: versions 1.3.0 and below and TIBCO Messaging - Eclipse Mosquitto Distribution - Bridge - Enterprise Edition: versions 1.3.0 and below.

Weakness: CWE-863 (Incorrect Authorization)

## Which versions are affected by CVE-2021-28826?

It affects 1 product.


Products: Tibco Messaging - Eclipse Mosquitto Distribution - Bridge.

## How do I fix CVE-2021-28826?

No fix has been published for CVE-2021-28826 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-28826 being exploited?

There is no known exploitation of CVE-2021-28826 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-28826 and fix it if it is affected.

What it is: CVE-2021-28826 is a high-severity vulnerability in TIBCO Messaging - Eclipse Mosquitto Distribution - Bridge - Community Edition, published on 14 Apr 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-28826 in the wild and no public exploit code.

Affected product: TIBCO Messaging - Eclipse Mosquitto Distribution - Bridge - Community Edition. 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-2021-28826/ (Markdown: https://insights.sbomify.com/CVE-2021-28826/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-28826
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-28826
- OSV: https://osv.dev/vulnerability/CVE-2021-28826

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-28826/
Summaries are generated and may contain mistakes; the official description above is the record.