CVE-2026-57997

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

CVSS 6.3 MEDIUMCWE-327

Vexday Risk Score

10Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 6.3EPSS —KEV nãoPoC —Nuclei —Metasploit —Patch referenciado

Lifecycle

29 Jun 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

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

Affected products

strapi · strapi

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References

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