TI-2021-09224 Aliases CVE-2021-27884 GHSA-2h3h-vw8r-82rp

Weak JSON Web Token (JWT) signing secret generation in YMFE YApi through 1.9.2 allows…

LOW 23CWE-330Published 2021-03-01 · Updated 2024-08-03

Key facts

Attack vector: Local
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: Low · Low · None
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub.

Summary

Weak JSON Web Token (JWT) signing secret generation in YMFE YApi through 1.9.2 allows recreation of other users' JWT tokens. This occurs because Math.random in Node.js is used.

Why it matters now

EPSS 0.00338 27th percentileScored 2026-11-07

Fix Fixed yapi-vendor (npm): 1.9.3

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA
—	yapi-vendor (npm)	before 1.9.3	1.9.3	Patch available	GHSA-2h3h-vw8r-82rp

— Vendor— Affected all versions Fixed in — No fix listed CNA
yapi-vendor (npm) Vendor— Affected before 1.9.3 Fixed in 1.9.3 Patch available GHSA-2h3h-vw8r-82rp

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:ymfe:yapi::::::::	up to 1.9.2	Vulnerable	Ymfe

cpe:2.3:a:ymfe:yapi:*:*:*:*:*:*:*:* Versions up to 1.9.2 Vulnerable ·Ymfe

Remediation

Fix · GHSA-2h3h-vw8r-82rp yapi-vendor (npm) Fixed in 1.9.3 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2021-27884
2026-10-03 Alias added: GHSA-2h3h-vw8r-82rp

References

Advisory 3

Other 1

https://github.com/YMFE/yapi/issues/2263

TI-2021-14834 Cross Site Scripting (XSS) vulnerability in yapi 1.9.1 allows attackers to execute… CVSS 3.1MEDIUM 5.4
TI-2025-43010 An issue pertaining to CWE-400: Uncontrolled Resource Consumption was discovered in YMFE… CVSS 3.1HIGH 7.5
TI-2025-43009 An issue pertaining to CWE-295: Improper Certificate Validation was discovered in YMFE… CVSS 3.1HIGH 7.4
TI-2018-12520 An issue was discovered in YMFE YApi 1.3.23. CVSS 3.0MEDIUM 5.4
TI-2025-43011 An issue pertaining to CWE-79: Improper Neutralization of Input During Web Page… CVSS 3.1MEDIUM 5.4

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences