Medium
Strapi users-permissions - JWT Algorithm Confusion via Missing Algorithm Configuration
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-57997
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 15:06 UTC · Revision 1
Source evidence
Strapi users-permissions - JWT Algorithm Confusion via Missing Algorithm Configuration
core-osv · Original sourcePublished 29 Jun 2026, 21:16 UTC
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.
osv:CVE-2026-57997
Complete source record
{
"id": "8e941c0577f86742c0a7feaeefa1705fca22b6659993ad01604dfd5eba160196",
"url": "https://osv.dev/vulnerability/CVE-2026-57997",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Strapi users-permissions - JWT Algorithm Confusion via Missing Algorithm Configuration",
"summary": "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.",
"evidence": "osv:CVE-2026-57997",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-57997",
"aliases": [
"CVE-2026-57997"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "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": [
{
"ranges": [
{
"repo": "https://github.com/strapi/strapi",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "4be93cf38bce0ed43eeaa0268b052ba0ef9b239a"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "5.7.0"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
},
{
"cpe": "cpe:2.3:a:strapi:strapi:*:*:*:*:*:node.js:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "5.7.0"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-57997.json"
}
}
],
"modified": "2026-10-28T02:30:36.614316038Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/57xxx/CVE-2026-57997.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-57997",
"https://www.vulncheck.com/advisories/strapi-users-permissions-jwt-algorithm-confusion-via-missing-algorithm-configuration",
"https://github.com/strapi/strapi/issues/26587",
"https://github.com/strapi/strapi/pull/26752",
"https://github.com/strapi/strapi"
],
"provider_metadata": {
"cwe_ids": [
"CWE-327"
],
"cna_assigner": "VulnCheck",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/57xxx/CVE-2026-57997.json"
}
},
"related_cves": [
{
"value": "CVE-2026-57997",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 503964,
"published_at": "2026-06-29T21:16:35.174+00:00"
}