---
id: CVE-2026-79575
title: >-
  The JWT signing secret in yfexam-exam v2.0 is derived from the username and
  the current month instead of a random server-side key, making the secret key
  easily obtainable via a bruteforce attack.
summary: >-
  The JWT signing secret in yfexam-exam v2.0 is derived from the username and
  the current month instead of a random server-side key, making the secret key
  easily obtainable via a bruteforce attack.
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-330
published: '2026-09-08'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T16:04:24.933'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-79575'
references:
  - url: 'https://github.com/fangtang7/CVE/blob/main/yf-exam/JWT.md'
    label: cve@mitre.org
  - url: 'https://github.com/fangtang7/CVE/blob/main/yf-exam/JWT.md'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-09T14:56:43.210579Z'
ingestedAt: '2026-09-08T15:33:26.985Z'
epss: 0.00245
epssPercentile: 0.16018
---

## Overview

The JWT signing secret in yfexam-exam v2.0 is derived from the username and the current month instead of a random server-side key, making the secret key easily obtainable via a bruteforce attack.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.