Vulnerabilities in pkg:nuget/Steeltoe.Security.Authentication.JwtBearer

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-7fqc-p256-7pwj",
  "modified" : "2026-07-02T20:31:47Z",
  "published" : "2026-07-02T20:31:47Z",
  "aliases" : [ "CVE-2026-50202" ],
  "summary" : "Steeltoe's static JWKS cache shared across schemes and never invalidated",
  "details" : "### Summary\n\nThe JWT signing key cache in `TokenKeyResolver` uses `kid` as the sole cache key without namespacing by authority. In applications with multiple `JwtBearer` schemes pointing to different identity providers, a key fetched for one scheme can satisfy token validation for another. Additionally, cached keys have no expiration, so rotated or revoked keys remain trusted until the application process restarts.\n\n### Impact\n\nIn multi-scheme deployments, an attacker who controls one identity provider's signing key can forge tokens accepted by other schemes within the same application. For all applications using `TokenKeyResolver`, a signing key removed from the identity provider's JWKS endpoint remains trusted indefinitely.\n\n### Mitigations\n\nIf an immediate upgrade is not possible:\n\n- In multi-scheme deployments, configure only one `JwtBearer` scheme per application when different identity providers are required.\n- Restart the application process after an identity provider signing key rotation to clear stale cached keys.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Steeltoe.Security.Authentication.JwtBearer"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "4.2.0"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 4.1.0"
    }
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Steeltoe.Security.Authentication.OpenIdConnect"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "4.2.0"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 4.1.0"
    }
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Steeltoe.Security.Authentication.CloudFoundryBase"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.4.0"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 3.3.0"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/SteeltoeOSS/security-advisories/security/advisories/GHSA-7fqc-p256-7pwj"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-50202"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/SteeltoeOSS/Steeltoe/commit/04db2ace3b806bfe0260bb7d4bda340f241eff48"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/SteeltoeOSS/Steeltoe/commit/17b27b8be546ae3f83a2f6e91d45e0c84c5314b7"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/SteeltoeOSS/security-advisories"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-668" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-07-02T20:31:47Z",
    "nvd_published_at" : "2026-06-17T23:17:04Z"
  }
}