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CVE-2026-57997— Strapi users-permissions - JWT Algorithm Confusion via Missing Algorithm Configuration

Quick assessment

Affected
strapi strapi
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Strapi是法国strapi公司开源的一套开源的内容管理系统(CMS)。 Strapi 5.7.0之前版本存在加密问题漏洞，该漏洞源于users-permissions插件在未显式配置plugin::users-permissions.jwt.algorithm时未能限制JWT算法，允许接受HS384和HS512令牌，拥有jwtSecret的攻击者可生成非标准HMAC变体的令牌以绕过算法限制并削弱身份验证控制。

CVSS 4.8 · Medium EPSS 0.25% · P15

Affected Version Matrix 1

VendorProduct Version RangeStatus
strapi strapi < 5.7.0 affected
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I. Basic Information for CVE-2026-57997

Vulnerability Information
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Vulnerability Title
Strapi users-permissions - JWT Algorithm Confusion via Missing Algorithm Configuration
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用已被攻破或存在风险的密码学算法
Source: CVE Program / CVE List V5
Vulnerability Title
Strapi 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Strapi是法国strapi公司开源的一套开源的内容管理系统(CMS)。 Strapi 5.7.0之前版本存在加密问题漏洞，该漏洞源于users-permissions插件在未显式配置plugin::users-permissions.jwt.algorithm时未能限制JWT算法，允许接受HS384和HS512令牌，拥有jwtSecret的攻击者可生成非标准HMAC变体的令牌以绕过算法限制并削弱身份验证控制。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
strapi strapi 0 ~ 5.7.0 -

II. Public POCs for CVE-2026-57997

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III. Intelligence Information for CVE-2026-57997

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Patches & Fixes for CVE-2026-57997 (1)

Vendor Advisories for CVE-2026-57997 (2)

IV. Related Vulnerabilities

Same product: strapi
Same vendor: strapi
Same weakness: CWE-327

V. Comments for CVE-2026-57997

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