# CVE-2019-15987: Cisco WebEx Centers Username Enumeration Information Disclosure Vulnerability

> Unauthenticated attackers can enumerate valid usernames and retrieve real names due to missing CAPTCHA protection in Cisco WebEx web interfaces.

- **Severity:** Medium 5.3 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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:** 26 Nov 2019
- **Updated:** 19 Nov 2024
- **Also known as:** GHSA-99jc-7925-7fc9

## What is CVE-2019-15987?

CVE-2019-15987 is a medium-severity vulnerability in Cisco Webex Meetings Online, published on 26 Nov 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability in web interface of the Cisco Webex Event Center, Cisco Webex Meeting Center, Cisco Webex Support Center, and Cisco Webex Training Center could allow an unauthenticated, remote attacker to guess account usernames. The vulnerability is due to missing CAPTCHA protection in certain URLs. An attacker could exploit this vulnerability by sending a crafted request to the web interface. A successful exploit could allow the attacker to know if a given username is valid and find the real name of the user.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2019-15987?

It affects 6 products.


Products: Cisco Webex Event Center, Cisco Webex Meeting Center, Cisco Webex Meetings Online, Cisco Webex Meetings Server, Cisco Webex Support Center, Cisco Webex Training Center.

## How do I fix CVE-2019-15987?

No fix has been published for CVE-2019-15987 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-15987 being exploited?

There is no known exploitation of CVE-2019-15987 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Webex Meetings Online

- [CVE-2017-6753](https://insights.sbomify.com/CVE-2017-6753/): Code injection in Cisco WebEx Browser Extension (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-15987 and fix it if it is affected.

What it is: CVE-2019-15987 is a medium-severity vulnerability in Cisco Webex Meetings Online, published on 26 Nov 2019. 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-2019-15987 in the wild and no public exploit code.

Affected product: Cisco Webex Meetings Online. 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-2019-15987/ (Markdown: https://insights.sbomify.com/CVE-2019-15987/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-15987
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-15987
- OSV: https://osv.dev/vulnerability/CVE-2019-15987

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-15987/
Summaries are generated and may contain mistakes; the official description above is the record.