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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.

PUBLISHED Reserved 2026-06-26 | Published 2026-06-29 | Updated 2026-07-09 | Assigner VulnCheck




MEDIUM: 6.3CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

MEDIUM: 4.8CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Problem types

Use of a Broken or Risky Cryptographic Algorithm

Product status

Default status
unaffected

Any version before 5.7.0
affected

Credits

BL4CK570RM reporter

References

github.com/strapi/strapi/issues/26587 (Pull Issue) issue-tracking

github.com/strapi/strapi/pull/26752 (Pull Issue) issue-tracking

github.com/strapi/strapi (Product Details) product

www.vulncheck.com/...ion-via-missing-algorithm-configuration third-party-advisory

cve.org (CVE-2026-57997)

nvd.nist.gov (CVE-2026-57997)

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