# CVE-2021-43136: Auth bypass in n/a

> An attacker can bypass authentication in FormaLMS to gain valid access to the platform, potentially leading to account takeover.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 10 Nov 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-r5fr-w3hg-pg7p

## What is CVE-2021-43136?

CVE-2021-43136 is a critical authentication bypass vulnerability in n/a, published on 10 Nov 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An authentication bypass issue in FormaLMS <= 2.4.4 allows an attacker to bypass the authentication mechanism and obtain a valid access to the platform.

Weakness: CWE-798 (Use of Hard-coded Credentials)

## Which versions are affected by CVE-2021-43136?

It affects 1 product.


Products: Formalms Formalms.

## How do I fix CVE-2021-43136?

No fix has been published for CVE-2021-43136 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-43136 being exploited?

There is no known exploitation of CVE-2021-43136 in the wild and no public exploit code.

Public exploit code:

- FormaLMS 2.4.4 - Authentication Bypass (exploitdb)

## Other vulnerabilities in n/a

- [CVE-2022-41681](https://insights.sbomify.com/CVE-2022-41681/): File Upload vulnerability in Forma LMS (critical 9.9)
- [CVE-2022-42925](https://insights.sbomify.com/CVE-2022-42925/): Unrestricted Upload of File with Dangerous Type in Forma LMS (critical 9.9)
- [CVE-2022-27104](https://insights.sbomify.com/CVE-2022-27104/): SQL injection in n/a (critical 9.8)
- [CVE-2020-26802](https://insights.sbomify.com/CVE-2020-26802/): Cross-site request forgery in n/a (high 8.8)
- [CVE-2022-42923](https://insights.sbomify.com/CVE-2022-42923/): SQL injection in Forma LMS (high 8.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-43136 and fix it if it is affected.

What it is: CVE-2021-43136 is a critical authentication bypass vulnerability in n/a, published on 10 Nov 2021. 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-2021-43136 in the wild and no public exploit code.

Affected product: n/a. 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-2021-43136/ (Markdown: https://insights.sbomify.com/CVE-2021-43136/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-43136
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-43136
- OSV: https://osv.dev/vulnerability/CVE-2021-43136

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-43136/
Summaries are generated and may contain mistakes; the official description above is the record.