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Advisories

Strapi users-permissions - JWT Algorithm Confusion via Missing Algorithm Configuration

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severity
medium
date
Affecting

  • strapi < 5.7.0 fixed in commit a4723b4

CWE
  • CWE-327 Use of a Broken or Risky Cryptographic Algorithm
CVSS
6.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Credit
BL4CK570RM
Description
Strapi users-permissions plugin fails to restrict JWT algorithms when plugin::users-permissions.jwt.algorithm is not explicitly configured, allowing acceptance of HS384 and HS512 tokens alongside HS256. Attackers possessing the jwtSecret can mint tokens with non-standard HMAC variants to bypass algorithm restrictions and weaken authentication controls.

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