# CVE-2026-33890: MyTube has an Unauthenticated Admin Privilege Escalation via Passkey Registration

> Unauthenticated attackers can register passkeys to gain full admin access, compromising the MyTube application.

- **Severity:** High 8.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 27 Mar 2026
- **Updated:** 27 Mar 2026
- **Also known as:** GHSA-378w-xh68-qrc8

## What is CVE-2026-33890?

CVE-2026-33890 is a high-severity authentication bypass vulnerability in franklioxygen MyTube, published on 27 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

MyTube is a self-hosted downloader and player for several video websites Prior to version 1.8.71, an unauthenticated attacker can register an arbitrary passkey and subsequently authenticate with it to obtain a full admin session. The application exposes passkey registration endpoints without requiring prior authentication. Any successfully authenticated passkey is automatically granted an administrator token, allowing full administrative access to the application. This enables a complete compromise of the application without requiring any existing credentials. Version 1.8.71 fixes the issue.

Weakness: CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2026-33890?

It affects 1 product.


Products: Franklioxygen Mytube.

## How do I fix CVE-2026-33890?

No fix has been published for CVE-2026-33890 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-33890 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-33890 exists.

## Other vulnerabilities in franklioxygen MyTube

- [CVE-2026-23837](https://insights.sbomify.com/CVE-2026-23837/): MyTube has an Authorization Bypass vulnerability (critical 9.8)
- [CVE-2026-24139](https://insights.sbomify.com/CVE-2026-24139/): MyTube Allows Unauthorized Database Export by Guest Users (high 8.7)
- [CVE-2026-33935](https://insights.sbomify.com/CVE-2026-33935/): MyTube has Unauthenticated Account Lockout via Shared Login Attempt State (high 7.7)
- [CVE-2026-33735](https://insights.sbomify.com/CVE-2026-33735/): MyTube has an Improper Access Control that Allows Complete Application Takeover (high 7.4)
- [CVE-2026-23848](https://insights.sbomify.com/CVE-2026-23848/): MyTube has Rate Limiting Bypass via X-Forwarded-For Header Spoofing (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-33890 and fix it if it is affected.

What it is: CVE-2026-33890 is a high-severity authentication bypass vulnerability in franklioxygen MyTube, published on 27 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-33890 exists.

Affected product: franklioxygen MyTube. 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-2026-33890/ (Markdown: https://insights.sbomify.com/CVE-2026-33890/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-33890
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-33890
- OSV: https://osv.dev/vulnerability/CVE-2026-33890

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-33890/
Summaries are generated and may contain mistakes; the official description above is the record.