What’s Vulnerable › Vulnerabilities

CVE-2023-31580

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-10-25 · updated 2026-06-17
• Weakness: CWE-295

Description

light-oauth2 before version 2.1.27 obtains the public key without any verification. This could allow attackers to authenticate to the application with a crafted JWT token.

Affected products

• networknt Light-Oauth2: before 2.1.27 — fixed in 2.1.27

How to fix

Upgrade to a fixed version: networknt Light-Oauth2 2.1.27. Check the vendor advisory for mitigations.

References

• https://github.com/KANIXB/JWTIssues/blob/main/Certification%20Verification%20issue%20in%20light-oauth2.md
• https://github.com/networknt/light-oauth2/issues/369
• https://github.com/KANIXB/JWTIssues/blob/main/Certification%20Verification%20issue%20in%20light-oauth2.md
• https://github.com/networknt/light-oauth2/issues/369

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