FKIE_CVE-2026-42083

Vulnerability from fkie_nvd - Published: 2026-05-27 17:16 - Updated: 2026-05-28 18:40
Severity
8.2 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Summary
free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, PCF Npcf_SMPolicyControl missing authentication middleware allows unauthenticated access to SM policy handlers and disclosure of subscriber SUPI. In NewServer(), the smPolicyGroup route group is created and routes are applied without attaching the router authorization middleware. In contrast, other PCF service groups such as Npcf_PolicyAuthorization do attach RouterAuthorizationCheck before route registration. Because the middleware is missing, requests to the /npcf-smpolicycontrol/v1/sm-policies, /npcf-smpolicycontrol/v1/sm-policies/{smPolicyId}, /npcf-smpolicycontrol/v1/sm-policies/{smPolicyId}/update, and /npcf-smpolicycontrol/v1/sm-policies/{smPolicyId}/delete endpoints can reach business logic even when no valid OAuth token is provided. This vulnerability is fixed in 4.2.2.
References
security-advisories@github.comhttps://github.com/free5gc/free5gc/issues/844Exploit, Issue Tracking
security-advisories@github.comhttps://github.com/free5gc/free5gc/security/advisories/GHSA-6rgm-gr97-x3j5Issue Tracking, Vendor Advisory
security-advisories@github.comhttps://github.com/free5gc/pcf/commit/8c4d457cdf58bb239ee30e88c56b370b22073964Patch
security-advisories@github.comhttps://github.com/free5gc/pcf/pull/63Issue Tracking, Patch
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/free5gc/free5gc/issues/844Exploit, Issue Tracking
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/free5gc/free5gc/security/advisories/GHSA-6rgm-gr97-x3j5Issue Tracking, Vendor Advisory
Impacted products
Vendor Product Version
free5gc free5gc *
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:free5gc:free5gc:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "EF7EBB95-EB4E-44C5-BF0A-9C99B0A7775F",
              "versionEndExcluding": "4.2.2",
              "vulnerable": true
            }
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          "negate": false,
          "operator": "OR"
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, PCF Npcf_SMPolicyControl missing authentication middleware allows unauthenticated access to SM policy handlers and disclosure of subscriber SUPI. In NewServer(), the smPolicyGroup route group is created and routes are applied without attaching the router authorization middleware. In contrast, other PCF service groups such as Npcf_PolicyAuthorization do attach RouterAuthorizationCheck before route registration. Because the middleware is missing, requests to the  /npcf-smpolicycontrol/v1/sm-policies, /npcf-smpolicycontrol/v1/sm-policies/{smPolicyId}, /npcf-smpolicycontrol/v1/sm-policies/{smPolicyId}/update, and /npcf-smpolicycontrol/v1/sm-policies/{smPolicyId}/delete endpoints can reach business logic even when no valid OAuth token is provided. This vulnerability is fixed in 4.2.2."
    }
  ],
  "id": "CVE-2026-42083",
  "lastModified": "2026-05-28T18:40:59.220",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 8.2,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N",
          "version": "3.1"
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        "impactScore": 4.2,
        "source": "security-advisories@github.com",
        "type": "Secondary"
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  "published": "2026-05-27T17:16:35.327",
  "references": [
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      "tags": [
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    }
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  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-862"
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      "source": "security-advisories@github.com",
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    }
  ]
}


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