353 – Lack of data validation - Token
Description
The generated JWT access token does not validate if the signature is valid so the token can be modified and requests are accepted; even removing the signature from the token works.
Impact
- Generate tokens by bypassing existing mechanisms. - Modify tokens allowing requests to be sent outside the application cycle.
Recommendation
Generate a token with random components without sensitive information and always validate that the integrity of the token is maintained (signature verification, signature).
Threat
Unauthorized attacker with access to a token.
Expected Remediation Time
Score 4.0
Default score using CVSS 4.0. It may change depending on the context of the src.
Base 4.0
- Attack vector: N
- Attack complexity: H
- Attack Requirements: N
- Privileges required: N
- User interaction: N
- Confidentiality (VC): N
- Integrity (VI): L
- Availability (VA): N
- Confidentiality (SC): N
- Integrity (SI): N
- Availability (SA): N
Threat 4.0
- Exploit maturity: U