What’s Vulnerable › Vulnerabilities

CVE-2021-27884

• Severity: medium (CVSS 5.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-03-01 · updated 2026-06-17
• Weakness: CWE-330

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.

Affected products

• Ymfe Yapi: through 1.9.2

References

• https://github.com/YMFE/yapi/issues/2117
• https://securitylab.github.com/advisories/GHSL-2020-228-YMFE-yapi
• https://github.com/YMFE/yapi/issues/2117
• https://securitylab.github.com/advisories/GHSL-2020-228-YMFE-yapi

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