CVE-2026-44523Public exploitNetwork attack vector

Account takeover via brute-forced JWT signing secret

Published May 14, 2026 · Updated May 14, 2026

Weak JWT signing in Enchanted Code Note Mark before 0.19.4 allows remote attackers to take over accounts by forging tokens. Base64Decoded.UnmarshalText decodes JWT_SECRET without validating that the resulting HS256 key is at least 32 bytes, and auth.go signs tokens with that key. Exploitation requires a deployed secret shorter than 32 bytes and one valid token to crack offline; a forged token authenticates as any user, including an administrator.

CVSS severity10.0
Critical
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Weak JWT signing in Enchanted Code Note Mark before 0.19.4 allows remote attackers to take over accounts by forging tokens. Base64Decoded.UnmarshalText decodes JWT_SECRET without validating that the resulting HS256 key is at least 32 bytes, and auth.go signs tokens with that key. Exploitation requires a deployed secret shorter than 32 bytes and one valid token to crack offline; a forged token authenticates as any user, including an administrator.

The record

CVE
CVE-2026-44523
Published
May 14, 2026
Updated
May 14, 2026
Vendor
Enchanted Code
Product
Note Mark
Classifications
CWE-345, CWE-326, T1550.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 14, 2026CVE publishedPublication date reported by the CVE source.
  2. May 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.19.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Enchanted Code · Note Markversion=< 0.19.4

Published CVSS scores

10.0GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-345Insufficient Verification of Data Authenticity
CWE-326Inadequate Encryption Strength
T1550.001Use Alternate Authentication Material: Application Access Token

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo