# CVE-2020-4662: Auth bypass in Event Streams

> Authenticated users can bypass authentication checks to perform unauthorized tasks on schemas in IBM Event Streams.

- **Severity:** Medium 6.5 (`CVSS:3.0/AV:N/A:N/C:N/UI:N/I:H/PR:L/AC:L/S:U/RC:C/E:U/RL:O`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 14 Aug 2020
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-m82w-fp43-whgx

## What is CVE-2020-4662?

CVE-2020-4662 is a medium-severity authentication bypass vulnerability in IBM Event Streams, published on 14 Aug 2020. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

IBM Event Streams 10.0.0 could allow an authenticated user to perform tasks to a schema due to improper authentication validation. IBM X-Force ID: 186233.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2020-4662?

It affects 1 product.


Products: Ibm Event Streams.

## How do I fix CVE-2020-4662?

No fix has been published for CVE-2020-4662 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-4662 being exploited?

There is no known exploitation of CVE-2020-4662 in the wild and no public exploit code.

## Other vulnerabilities in IBM Event Streams

- [CVE-2018-1833](https://insights.sbomify.com/CVE-2018-1833/): Other in Event Streams (medium 5.3)
- [CVE-2021-29792](https://insights.sbomify.com/CVE-2021-29792/): Privilege escalation in Event Streams (medium 4.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-4662 and fix it if it is affected.

What it is: CVE-2020-4662 is a medium-severity authentication bypass vulnerability in IBM Event Streams, published on 14 Aug 2020. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-4662 in the wild and no public exploit code.

Affected product: IBM Event Streams. 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-2020-4662/ (Markdown: https://insights.sbomify.com/CVE-2020-4662/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-4662
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-4662
- OSV: https://osv.dev/vulnerability/CVE-2020-4662

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-4662/
Summaries are generated and may contain mistakes; the official description above is the record.