CVE-2026-57997

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.

Score

CVSS 4.0 6.3 Medium

Status

Analyzed - disclosure@vulncheck.com

Published

2026-06-29

Last modified

2026-10-25

Weaknesses

CWE-327

Affected products

• Strapi (Strapi)

References

• https://github.com/strapi/strapi/issues/26587
• https://github.com/strapi/strapi/pull/26752
• https://github.com/strapi/strapi
• https://www.vulncheck.com/advisories/strapi-users-permissions-jwt-algorithm-confusion-via-missing-algorithm-configurati…