# CVE-2026-20342: Cisco Secure Firewall Management Center Software Low Privileged Arbitrary File Download Vulnerability

> Authenticated attackers can download arbitrary files from Cisco Secure Firewall Management Center due to unsanitized input in a file download API.

- **Severity:** High 7.7 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 16 Sep 2026
- **Updated:** 17 Sep 2026
- **Also known as:** GHSA-2784-9wmv-5cq2

## What is CVE-2026-20342?

CVE-2026-20342 is a high-severity path traversal vulnerability in Cisco Secure Firewall Management Center (FMC), published on 16 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability in a specific file download API of Cisco Secure FMC Software could allow an authenticated, remote attacker to download arbitrary files from an affected system.

This vulnerability exists because user input is not being sanitized. An attacker could exploit this vulnerability by sending a crafted HTTPS request. A successful exploit could allow the attacker to download arbitrary files from the affected system.
To exploit this vulnerability, the attacker must have valid credentials for a user account with at least the role of Security Analyst (read-only).

Weakness: CWE-639 (Authorization Bypass Through User-Controlled Key)

## Which versions are affected by CVE-2026-20342?


## How do I fix CVE-2026-20342?

No fix has been published for CVE-2026-20342 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-20342 being exploited?

There is no known exploitation of CVE-2026-20342 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-20342 and fix it if it is affected.

What it is: CVE-2026-20342 is a high-severity path traversal vulnerability in Cisco Secure Firewall Management Center (FMC), published on 16 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-20342 in the wild and no public exploit code.

Affected product: Cisco Secure Firewall Management Center (FMC). 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-2026-20342/ (Markdown: https://insights.sbomify.com/CVE-2026-20342/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-20342
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-20342
- OSV: https://osv.dev/vulnerability/CVE-2026-20342

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-20342/
Summaries are generated and may contain mistakes; the official description above is the record.