# CVE-2019-1866: Cisco Webex Business Suite Host Header Value Integrity Vulnerability

> An attacker in a privileged network position can manipulate host headers to redirect users to arbitrary sites, compromising application integrity.

- **Severity:** Low 3.1 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 13 Apr 2020
- **Updated:** 15 Nov 2024
- **Also known as:** GHSA-6gq6-x7pv-3ggr

## What is CVE-2019-1866?

CVE-2019-1866 is a low-severity vulnerability in Cisco Webex Business Suite, published on 13 Apr 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Cisco Webex Business Suite before 39.1.0 contains a vulnerability that could allow an unauthenticated, remote attacker to affect the integrity of the application. The vulnerability is due to improper validation of host header values. An attacker with a privileged network position, either a man-in-the-middle or by intercepting wireless network traffic, could exploit this vulnerability to manipulate header values sent by a client to the affected application. The attacker could cause the application to use input from the header to redirect a user from the Cisco Webex Meetings Online site to an arbitrary site of the attacker's choosing.

Weakness: CWE-345 (Insufficient Verification of Data Authenticity), CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2019-1866?

It affects 1 product.


Products: Cisco Webex Business Suite 39.

## How do I fix CVE-2019-1866?

No fix has been published for CVE-2019-1866 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-1866 being exploited?

There is no known exploitation of CVE-2019-1866 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-1866 and fix it if it is affected.

What it is: CVE-2019-1866 is a low-severity vulnerability in Cisco Webex Business Suite, published on 13 Apr 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2019-1866 in the wild and no public exploit code.

Affected product: Cisco Webex Business Suite. 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-2019-1866/ (Markdown: https://insights.sbomify.com/CVE-2019-1866/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-1866
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-1866
- OSV: https://osv.dev/vulnerability/CVE-2019-1866

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From sbomify Insights: https://insights.sbomify.com/CVE-2019-1866/
Summaries are generated and may contain mistakes; the official description above is the record.