# CVE-2026-20128: Cisco Catalyst SD-WAN Manager Storing Passwords in a Recoverable Format

> An unauthenticated remote attacker can read a credential file to gain DCA user privileges on Cisco Catalyst SD-WAN Manager systems.

- **Severity:** High 7.5 (`CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H`)
- **Exploited in the wild:** Yes, since 20 Apr 2026 (CISA KEV)
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 25 Feb 2026
- **Updated:** 21 Apr 2026
- **Also known as:** GHSA-mp6j-7g85-8pg2

## What is CVE-2026-20128?

CVE-2026-20128 is a high-severity vulnerability in Cisco Catalyst Sd-Wan Manager, published on 25 Feb 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A vulnerability in the Data Collection Agent (DCA) feature of Cisco Catalyst SD-WAN Manager could allow an unauthenticated, remote attacker to gain DCA user privileges on an affected system.

This vulnerability is due to the presence of a credential file for the DCA user on an affected system. An attacker could exploit this vulnerability by sending a crafted HTTP request and reading the file that contains the DCA password from that affected system. A successful exploit could allow the attacker to access another affected system and gain DCA user privileges.
Note: Cisco Catalyst SD-WAN Manager releases 20.18 and later are not affected by this vulnerability.

Weakness: CWE-257 (Storing Passwords in a Recoverable Format)

## Which versions are affected by CVE-2026-20128?

It affects 1 product.


Products: Cisco Catalyst Sd-Wan Manager.

## How do I fix CVE-2026-20128?

No fix has been published for CVE-2026-20128 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 23 Apr 2026.

## Is CVE-2026-20128 being exploited?

Yes. Attackers have exploited CVE-2026-20128 in the wild since at least 20 Apr 2026.

## Other vulnerabilities in Cisco Catalyst Sd-Wan Manager

- [CVE-2026-20182](https://insights.sbomify.com/CVE-2026-20182/): Cisco Catalyst SD-WAN Controller Authentication Bypass (critical 10.0, exploited in the wild)
- [CVE-2026-20127](https://insights.sbomify.com/CVE-2026-20127/): Cisco Catalyst SD-WAN Controller and Manager Authentication Bypass (critical 10.0, exploited in the wild)
- [CVE-2026-76504](https://insights.sbomify.com/CVE-2026-76504/): Cisco Catalyst SD-WAN Manager Hex Encoding (critical 9.8, exploited in the wild)
- [CVE-2026-20245](https://insights.sbomify.com/CVE-2026-20245/): Cisco Catalyst SD-WAN Manager Improper Encoding or Escaping of Output (high 7.8, exploited in the wild)
- [CVE-2022-20775](https://insights.sbomify.com/CVE-2022-20775/): Cisco SD-WAN Path Traversal (high 7.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-20128 and fix it if it is affected.

What it is: CVE-2026-20128 is a high-severity vulnerability in Cisco Catalyst Sd-Wan Manager, published on 25 Feb 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: Yes. Attackers have exploited CVE-2026-20128 in the wild since at least 20 Apr 2026.

Affected product: Cisco Catalyst Sd-Wan Manager. 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-2026-20128/ (Markdown: https://insights.sbomify.com/CVE-2026-20128/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-20128
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-20128
- OSV: https://osv.dev/vulnerability/CVE-2026-20128

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-20128/
Summaries are generated and may contain mistakes; the official description above is the record.