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Vulnerability record · CVE-2021-27884 · published 1 March 2021

CVE-2021-27884: Ymfe yapi vulnerability

Ymfe · Yapi

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.

5.1 CVSS 3.1 Medium EPSS 0.34% · top 75.3% CWE-330 · CWE-330
5.1CVSS 3.1 base score, v2 3.6
0.34%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/YMFE/yapi/issues/2117 Third Party Advisory
https://securitylab.github.com/advisories/GHSL-2020-228-YMFE-yapi Third Party Advisory
https://github.com/YMFE/yapi/issues/2117 Third Party Advisory
https://securitylab.github.com/advisories/GHSL-2020-228-YMFE-yapi Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.5CVE-2025-70059Ymfe yapi uncontrolled resource consumption vulnerabilityAn issue pertaining to CWE-400: Uncontrolled Resource Consumption was discovered in YMFE yapi v1.12.0 and allows attackers to cause a denial of servi…EPSS 0.34%7.4CVE-2025-70058Ymfe yapi improper certificate validation vulnerabilityAn issue pertaining to CWE-295: Improper Certificate Validation was discovered in YMFE yapi v1.12.0. The application disables TLS/SSL certificate val…EPSS 0.18%5.4CVE-2025-70060Ymfe yapi cross-site scripting vulnerabilityAn issue pertaining to CWE-79: Improper Neutralization of Input During Web Page Generation was discovered in YMFE yapi v1.12.0.EPSS 0.19%5.4CVE-2021-36686Ymfe yapi cross-site scripting vulnerabilityCross Site Scripting (XSS) vulnerability in yapi 1.9.1 allows attackers to execute arbitrary code via the /interface/api edit page.EPSS 0.54%5.4CVE-2018-17574Ymfe yapi cross-site scripting vulnerabilityAn issue was discovered in YMFE YApi 1.3.23. There is stored XSS in the name field of a project.EPSS 0.67%

Source: NIST National Vulnerability Database (record CVE-2021-27884), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.