# CVE-2019-3787: UAA defaults email address to an insecure domain

> Attackers can hijack user accounts by exploiting default email domain fallbacks that direct password recovery emails to attacker-controlled domains.

- **Severity:** High 8.3 (`CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H`)
- **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:** 19 Jun 2019
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-7rf4-2hjj-cg48

## What is CVE-2019-3787?

CVE-2019-3787 is a high-severity vulnerability in Cloud Foundry UAA Release (OSS), published on 19 Jun 2019. 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

Cloud Foundry UAA, versions prior to 73.0.0, falls back to appending “unknown.org” to a user's email address when one is not provided and the user name does not contain an @ character. This domain is held by a private company, which leads to attack vectors including password recovery emails sent to a potentially fraudulent address. This would allow the attacker to gain complete control of the user's account.

Weakness: CWE-640 (Weak Password Recovery Mechanism for Forgotten Password), CWE-840

## Which versions are affected by CVE-2019-3787?

It affects 1 product.


Products: Pivotal Software Cloud Foundry Uaa-Release.

## How do I fix CVE-2019-3787?

No fix has been published for CVE-2019-3787 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-3787 being exploited?

There is no known exploitation of CVE-2019-3787 in the wild and no public exploit code.

## Other vulnerabilities in Cloud Foundry UAA Release (OSS)

- [CVE-2019-11268](https://insights.sbomify.com/CVE-2019-11268/): UAA SQL Identity Zone Vulnerability (medium 6.5)
- [CVE-2018-15754](https://insights.sbomify.com/CVE-2018-15754/): UAA can issue tokens across identity providers if users with matching usernames exist (medium 4.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-3787 and fix it if it is affected.

What it is: CVE-2019-3787 is a high-severity vulnerability in Cloud Foundry UAA Release (OSS), published on 19 Jun 2019. 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-2019-3787 in the wild and no public exploit code.

Affected product: Cloud Foundry UAA Release (OSS). 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-2019-3787/ (Markdown: https://insights.sbomify.com/CVE-2019-3787/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-3787
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-3787
- OSV: https://osv.dev/vulnerability/CVE-2019-3787

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-3787/
Summaries are generated and may contain mistakes; the official description above is the record.