---
title: "CVE-2026-44523: Note Mark has a JWT Secret Weakness that allows Full Account Takeover via Token Forgery"
url: https://erroneo.us/security/cve/CVE-2026-44523/
description: "CVE-2026-44523 (github.com/enchant97/note-mark/backend (Go)): Note Mark is an open-source note-taking application. Prior to 0.19.4, no minimum length or…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-05-14
date_modified: 2026-05-15
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-44523"
kev: false
cvss: 10
epss: 0.00163
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-44523: Note Mark has a JWT Secret Weakness that allows Full Account Takeover via Token Forgery

**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 0.2% , percentile 5: FIRST’s model estimates a 0.2% chance of exploitation activity in the next 30 days, higher than 5% 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) < 0.0.0-20260501152247-18b587758667, fixed in 0.0.0-20260501152247-18b587758667 . Check your lockfile, including transitive dependencies.

## What it is

Note Mark is an open-source note-taking application. Prior to 0.19.4, no minimum length or entropy is enforced on the JWTSECRET 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.

## Affected packages

- Go `github.com/enchant97/note-mark/backend` < 0.0.0-20260501152247-18b587758667 → fixed: 0.0.0-20260501152247-18b587758667

## Affected products (CVE record)

- enchant97 note-mark: < 0.19.4

## Severity

- GitHub_M CVSS 3.1: 10 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N`
- GitHub CVSS 3.1: 10.0 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N`

## 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): 0.16% probability of exploitation activity in the next 30 days; percentile 5.

## Sources

- [GitHub Advisory GHSA-q6mh-rqwh-g786](https://github.com/advisories/GHSA-q6mh-rqwh-g786)
- [CVE.org record CVE-2026-44523](https://www.cve.org/CVERecord?id=CVE-2026-44523)
- [NVD entry CVE-2026-44523](https://nvd.nist.gov/vuln/detail/CVE-2026-44523)
- [github.com](https://github.com/enchant97/note-mark/security/advisories/GHSA-q6mh-rqwh-g786)
- [github.com](https://github.com/enchant97/note-mark/commit/18b58775866776ed400c403dd0ccad68c1fa4802)
- [github.com](https://github.com/enchant97/note-mark/releases/tag/v0.19.4)

---
Source page: https://erroneo.us/security/cve/CVE-2026-44523/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt