CVE-2026-79575 Details
Description
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.
A vulnerability exists in yfexam-exam version 2.0 due to the JWT signing secret being derived from the username and the current month, rather than a random server-side key. This predictable secret can be exploited through a brute-force attack, allowing an attacker to forge a valid JWT and authenticate as a user without a password. The issue is present in yf-exam-lite, an open-source online examination system, specifically in version 1.0.0.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 8, 2026CISA-ADP
Assessed Sep 9, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/fangtang7/CVE/blob/main/yf-exam/JWT.md | CISA-ADP | ExploitTechnical Analysis |
| https://github.com/fangtang7/CVE/blob/main/yf-exam/JWT.md | [email protected] | ExploitTechnical Analysis |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-330 | Use of Insufficiently Random Values | CISA-ADP |
Affected Products
| Product | Versions |
|---|---|
| yfexam-exam | 1.0.0 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 9, 2026 | CVE Modified | CISA-ADP |
| Sep 8, 2026 | New CVE Received | [email protected] |