VULNERABILITY INTELLIGENCE

CVE-2016-10555

CVSS score6.5 MEDIUM
EPSS probability4.78%
CISA KEVNot currently listed
Published2018-05-31
Last modified2026-06-17
CVSS vectorCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Description

Since "algorithm" isn't enforced in jwt.decode()in jwt-simple 0.3.0 and earlier, a malicious user could choose what algorithm is sent sent to the server. If the server is expecting RSA but is sent HMAC-SHA with RSA's public key, the server will think the public key is actually an HMAC private key. This could be used to forge any data an attacker wants.

Weakness classification

  • CWE-20: Improper Input Validation

Primary references