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

CVE-2026-41571 · Severity: critical · CVSS 9.4 · Published 2026-05-04

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.

Technologies: github.com/enchant97/note-mark/backend (Go). Vendors: Go.

Quick answers

Is CVE-2026-41571 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-41571 being exploited in the wild.
How severe is CVE-2026-41571?
Critical severity, with a CVSS score of 9.4, published 4 May 2026.
Which products and versions are affected?
github.com/enchant97/note-mark/backend (Go) SEMVER:introduced=0,fixed=0.0.0-20260417132909-dea5530cc989.
Is there a fix for CVE-2026-41571?
Yes. github.com/enchant97/note-mark/backend (Go): upgrade to 0.0.0-20260417132909-dea5530cc989 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2026-41571?
Check whether you run github.com/enchant97/note-mark/backend (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • github.com/enchant97/note-mark/backend (Go): upgrade to 0.0.0-20260417132909-dea5530cc989 or later
    go get github.com/enchant97/note-mark/backend@v0.0.0-20260417132909-dea5530cc989

Affected products

  • github.com/enchant97/note-mark/backend (Go) SEMVER:introduced=0,fixed=0.0.0-20260417132909-dea5530cc989

Identifiers

  • CVE-2026-41571
  • GHSA-pxf8-6wqm-r6hh
  • GO-2026-5557

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