# CVE-2021-45786: Auth bypass in n/a

> Attackers can bypass authentication in Maccms v10 via login parameters to gain unauthorized privileges and access user accounts.

- **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:** 16 Mar 2022
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-vqhx-92pw-qxpw

## What is CVE-2021-45786?

CVE-2021-45786 is a critical authentication bypass vulnerability in n/a, published on 16 Mar 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

In maccms v10, an attacker can log in through /index.php/user/login in the "col" and "openid" parameters to gain privileges.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2021-45786?

It affects 1 product.


Products: Maccms Maccms.

## How do I fix CVE-2021-45786?

No fix has been published for CVE-2021-45786 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-45786 being exploited?

There is no known exploitation of CVE-2021-45786 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2020-21359](https://insights.sbomify.com/CVE-2020-21359/): File upload in n/a (critical 9.8)
- [CVE-2017-17733](https://insights.sbomify.com/CVE-2017-17733/): Command injection in n/a (critical 9.8)
- [CVE-2025-28089](https://insights.sbomify.com/CVE-2025-28089/): Server-side request forgery in n/a (critical 9.1)
- [CVE-2025-28090](https://insights.sbomify.com/CVE-2025-28090/): Server-side request forgery in n/a (critical 9.1)
- [CVE-2025-28091](https://insights.sbomify.com/CVE-2025-28091/): Server-side request forgery in n/a (critical 9.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-45786 and fix it if it is affected.

What it is: CVE-2021-45786 is a critical authentication bypass vulnerability in n/a, published on 16 Mar 2022. 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-2021-45786 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-2021-45786/ (Markdown: https://insights.sbomify.com/CVE-2021-45786/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-45786
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-45786
- OSV: https://osv.dev/vulnerability/CVE-2021-45786

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-45786/
Summaries are generated and may contain mistakes; the official description above is the record.