# CVE-2019-1636: Cisco Webex Teams URI Handler Insecure Library Loading Vulnerability

> An attacker can execute arbitrary commands by tricking a user into clicking a malicious link that triggers insecure library loading in Cisco Webex Teams.

- **Severity:** High 7.8 (`CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 23 Jan 2019
- **Updated:** 20 Nov 2024
- **Also known as:** GHSA-wrf3-rqxm-457j

## What is CVE-2019-1636?

CVE-2019-1636 is a high-severity code injection vulnerability in Cisco Webex Teams, published on 23 Jan 2019. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

A vulnerability in the Cisco Webex Teams client, formerly Cisco Spark, could allow an attacker to execute arbitrary commands on a targeted system. This vulnerability is due to unsafe search paths used by the application URI that is defined in Windows operating systems. An attacker could exploit this vulnerability by convincing a targeted user to follow a malicious link. Successful exploitation could cause the application to load libraries from the directory targeted by the URI link. The attacker could use this behavior to execute arbitrary commands on the system with the privileges of the targeted user if the attacker can place a crafted library in a directory that is accessible to the vulnerable system.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2019-1636?

It affects 1 product.


Products: Cisco Webex Teams.

## How do I fix CVE-2019-1636?

No fix has been published for CVE-2019-1636 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-1636 being exploited?

There is no known exploitation of CVE-2019-1636 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Webex Teams

- [CVE-2025-20236](https://insights.sbomify.com/CVE-2025-20236/): Cisco Webex App Client-Side Remote Code Execution Vulnerability (high 8.8)
- [CVE-2018-0387](https://insights.sbomify.com/CVE-2018-0387/): Code injection in Cisco Webex Teams unknown (high 8.8)
- [CVE-2018-0436](https://insights.sbomify.com/CVE-2018-0436/): Cisco Webex Teams Information Disclosure and Modification Vulnerability (high 8.7)
- [CVE-2020-3535](https://insights.sbomify.com/CVE-2020-3535/): Cisco Webex Teams Client for Windows DLL Hijacking Vulnerability (high 7.8)
- [CVE-2019-1939](https://insights.sbomify.com/CVE-2019-1939/): Cisco Webex Teams Logging Feature Command Execution Vulnerability (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-1636 and fix it if it is affected.

What it is: CVE-2019-1636 is a high-severity code injection vulnerability in Cisco Webex Teams, published on 23 Jan 2019. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2019-1636 in the wild and no public exploit code.

Affected product: Cisco Webex Teams. 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-2019-1636/ (Markdown: https://insights.sbomify.com/CVE-2019-1636/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-1636
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-1636
- OSV: https://osv.dev/vulnerability/CVE-2019-1636

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From sbomify Insights: https://insights.sbomify.com/CVE-2019-1636/
Summaries are generated and may contain mistakes; the official description above is the record.