What’s Vulnerable › Vulnerabilities

CVE-2018-1000125

• Severity: critical (CVSS 9.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-03-13 · updated 2026-06-17
• Weakness: CWE-20

Description

inversoft prime-jwt version prior to version 1.3.0 or prior to commit 0d94dcef0133d699f21d217e922564adbb83a227 contains an input validation vulnerability in JWTDecoder.decode that can result in a JWT that is decoded and thus implicitly validated even if it lacks a valid signature. This attack appear to be exploitable via an attacker crafting a token with a valid header and body and then requests it to be validated. This vulnerability appears to have been fixed in 1.3.0 and later or after commit 0d94dcef0133d699f21d217e922564adbb83a227.

Affected products

• Inversoft Prime-Jwt: before 1.3.0 — fixed in 1.3.0

How to fix

Upgrade to a fixed version: Inversoft Prime-Jwt 1.3.0. Check the vendor advisory for mitigations.

References

• https://github.com/inversoft/prime-jwt/blob/master/CHANGES
• https://github.com/inversoft/prime-jwt/issues/2
• https://github.com/inversoft/prime-jwt/blob/master/CHANGES
• https://github.com/inversoft/prime-jwt/issues/2

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