---
title: "CVE-2026-41571: Note Mark: OIDC-registered users authenticated by submitting password \"null\""
url: https://erroneo.us/security/cve/CVE-2026-41571/
description: "CVE-2026-41571 (github.com/enchant97/note-mark/backend (Go)): Note Mark is an open-source note-taking application. In version 0.19.2, IsPasswordMatch in…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-05-04
date_modified: 2026-05-07
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-41571"
kev: false
cvss: 9.4
epss: 0.00477
license: All rights reserved. Quote with attribution and a link.
---

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

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Not in CISA KEV , but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 0.5% , percentile 40: FIRST’s model estimates a 0.5% chance of exploitation activity in the next 30 days, higher than 40% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes github.com/enchant97/note-mark/backend (Go) < 0.0.0-20260417132909-dea5530cc989, fixed in 0.0.0-20260417132909-dea5530cc989 . Check your lockfile, including transitive dependencies.

## What it is

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.

## Affected packages

- Go `github.com/enchant97/note-mark/backend` < 0.0.0-20260417132909-dea5530cc989 → fixed: 0.0.0-20260417132909-dea5530cc989

## Affected products (CVE record)

- enchant97 note-mark: = 0.19.2

## Severity

- GitHub_M CVSS 3.1: 9.4 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L`
- GitHub CVSS 3.1: 9.4 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.48% probability of exploitation activity in the next 30 days; percentile 40.

## Sources

- [GitHub Advisory GHSA-pxf8-6wqm-r6hh](https://github.com/advisories/GHSA-pxf8-6wqm-r6hh)
- [CVE.org record CVE-2026-41571](https://www.cve.org/CVERecord?id=CVE-2026-41571)
- [NVD entry CVE-2026-41571](https://nvd.nist.gov/vuln/detail/CVE-2026-41571)
- [github.com](https://github.com/enchant97/note-mark/security/advisories/GHSA-pxf8-6wqm-r6hh)
- [github.com](https://github.com/enchant97/note-mark/releases/tag/v0.19.3)
- [github.com](https://github.com/enchant97/note-mark/commit/dea5530cc9891187b51548ef9f2868b7dc9f4e92)

---
Source page: https://erroneo.us/security/cve/CVE-2026-41571/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt