CVE-2026-57997

MEDIUM 4.8

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

CVSS Score

4.8

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-327
Vendor	strapi
Product	strapi
Published	Jun 29, 2026

Stay Ahead of the Next One

Get instant alerts for strapi strapi

Be the first to know when new medium vulnerabilities affecting strapi strapi are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Affected Versions

strapi / strapi

0 < 5.7.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

🔍 BL4CK570RM