# CVE-2016-6426: Missing authorization in n/a

> Remote attackers can create user accounts in Cisco Unified Intelligence Center by accessing an unprotected web page, leading to unauthorized access.

- **Severity:** High 7.5 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 5 Oct 2016
- **Updated:** 6 Aug 2024
- **Also known as:** GHSA-rc67-hjj5-jc2r

## What is CVE-2016-6426?

CVE-2016-6426 is a high-severity missing authorization vulnerability in n/a, published on 5 Oct 2016. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The j_spring_security_switch_user function in Cisco Unified Intelligence Center (CUIC) 8.5.4 through 9.1(1), as used in Unified Contact Center Express 10.0(1) through 11.0(1), allows remote attackers to create user accounts by visiting an unspecified web page, aka Bug IDs CSCuy75027 and CSCuy81653.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2016-6426?

It affects 2 products.


Products: Cisco Unified Contact Center Express, Cisco Unified Intelligence Center.

## How do I fix CVE-2016-6426?

No fix has been published for CVE-2016-6426 yet. Limit exposure of the affected software until one is available.

## Is CVE-2016-6426 being exploited?

There is no known exploitation of CVE-2016-6426 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2025-20354](https://insights.sbomify.com/CVE-2025-20354/): Cisco Unified Contact Center Express Remote Code Execution Vulnerability (critical 9.8)
- [CVE-2020-3280](https://insights.sbomify.com/CVE-2020-3280/): Cisco Unified Contact Center Express Remote Code Execution Vulnerability (critical 9.8)
- [CVE-2018-0403](https://insights.sbomify.com/CVE-2018-0403/): Information disclosure in Cisco Unified Contact Center Express unknown (critical 9.8)
- [CVE-2022-20658](https://insights.sbomify.com/CVE-2022-20658/): Privilege escalation in Cisco Unified Contact Center Domain Manager (critical 9.6)
- [CVE-2025-20358](https://insights.sbomify.com/CVE-2025-20358/): Cisco Unified Contact Center Express Editor Authentication Bypass Vulnerability (critical 9.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2016-6426 and fix it if it is affected.

What it is: CVE-2016-6426 is a high-severity missing authorization vulnerability in n/a, published on 5 Oct 2016. 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-2016-6426 in the wild and no public exploit code.

Affected product: n/a. 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-2016-6426/ (Markdown: https://insights.sbomify.com/CVE-2016-6426/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2016-6426
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2016-6426
- OSV: https://osv.dev/vulnerability/CVE-2016-6426

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From sbomify Insights: https://insights.sbomify.com/CVE-2016-6426/
Summaries are generated and may contain mistakes; the official description above is the record.