# CVE-2020-26062: Cisco Integrated Management Controller Username Enumeration Vulnerability

> Unauthenticated attackers can enumerate valid administrative usernames via authentication response differences in Cisco Integrated Management Controller.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/RL:X/RC:X/E:X`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 Nov 2024
- **Updated:** 18 Nov 2024
- **Also known as:** GHSA-m96v-gj29-hf2q

## What is CVE-2020-26062?

CVE-2020-26062 is a medium-severity vulnerability in Cisco Unified Computing System, published on 18 Nov 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability in Cisco Integrated Management Controller could allow an unauthenticated, remote attacker to enumerate valid usernames within the vulnerable application.
The vulnerability is due to differences in authentication responses sent back from the application as part of an authentication attempt. An attacker could exploit this vulnerability by sending authentication requests to the affected application. A successful exploit could allow the attacker to confirm the names of administrative user accounts for use in further attacks.There are no workarounds that address this vulnerability.

Weakness: CWE-203 (Observable Discrepancy)

## Which versions are affected by CVE-2020-26062?

It affects 1 product.


Products: Cisco Unified Computing System.

## How do I fix CVE-2020-26062?

No fix has been published for CVE-2020-26062 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-26062 being exploited?

There is no known exploitation of CVE-2020-26062 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Unified Computing System

- [CVE-2026-20200](https://insights.sbomify.com/CVE-2026-20200/): Cisco Integrated Management Controller Argument Injection and Remote Code Execution Vulnerability (high 8.8)
- [CVE-2026-20094](https://insights.sbomify.com/CVE-2026-20094/): Cisco Integrated Management Controller Command Injection Vulnerability (high 8.8)
- [CVE-2018-0430](https://insights.sbomify.com/CVE-2018-0430/): Cisco Integrated Management Controller Command Injection Vulnerability (high 8.8)
- [CVE-2018-0431](https://insights.sbomify.com/CVE-2018-0431/): Cisco Integrated Management Controller Command Injection Vulnerability (high 8.8)
- [CVE-2012-4078](https://insights.sbomify.com/CVE-2012-4078/): Auth bypass in n/a (high 8.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-26062 and fix it if it is affected.

What it is: CVE-2020-26062 is a medium-severity vulnerability in Cisco Unified Computing System, published on 18 Nov 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-26062 in the wild and no public exploit code.

Affected product: Cisco Unified Computing System. 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-2020-26062/ (Markdown: https://insights.sbomify.com/CVE-2020-26062/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-26062
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-26062
- OSV: https://osv.dev/vulnerability/CVE-2020-26062

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-26062/
Summaries are generated and may contain mistakes; the official description above is the record.