Medium severity · published Jun 29, 2026
CVE-2026-57997
Strapi users-permissions - JWT Algorithm Confusion via Missing Algorithm Configuration
5.4
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 16% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ST
strapi · strapi
before 5.7.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-57997
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-57997
Product
https://github.com/strapi/strapi
Issue Tracking
https://github.com/strapi/strapi/issues/26587
Issue Tracking
https://github.com/strapi/strapi/pull/26752
Patch
https://www.vulncheck.com/advisories/strapi-users-permissions-jwt-algorithm-confusion-via-missing-algorithm-configuration
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