CVE-2026-45156 (GCVE-0-2026-45156)
Vulnerability from cvelistv5
Published
2026-06-01 16:38
Modified
2026-06-03 03:55
Severity ?
8.1 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
CWE
  • CWE-287 - Improper Authentication
Summary
Nextcloud is an open source content collaboration platform. From versions 0.3.0 to before 3.1.0, 5.0.0 to before 5.1.0, and 6.0.0 to before 6.4.0, a missing signature verification in User OIDC allowed a malicious ID4me authority to identify as any user. This issue has been patched in versions 3.1.0, 4.1.0, 5.1.0, 6.4.0 and 8.3.0.
References
Impacted products
Vendor Product Version
nextcloud security-advisories Version: >= 0.3.0, < 3.1.0
Version: >= 5.0.0, < 5.1.0
Version: >= 6.0.0, < 6.4.0
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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-45156",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-02T00:00:00+00:00",
                "version": "2.0.3"
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        "providerMetadata": {
          "dateUpdated": "2026-06-03T03:55:47.564Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
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    "cna": {
      "affected": [
        {
          "product": "security-advisories",
          "vendor": "nextcloud",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 0.3.0, \u003c 3.1.0"
            },
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              "status": "affected",
              "version": "\u003e= 5.0.0, \u003c 5.1.0"
            },
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      "descriptions": [
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          "value": "Nextcloud is an open source content collaboration platform. From versions 0.3.0 to before 3.1.0, 5.0.0 to before 5.1.0, and 6.0.0 to before 6.4.0, a missing signature verification in User OIDC allowed a malicious ID4me authority to identify as any user. This issue has been patched in versions 3.1.0, 4.1.0, 5.1.0, 6.4.0 and 8.3.0."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N",
            "version": "3.1"
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      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-287",
              "description": "CWE-287: Improper Authentication",
              "lang": "en",
              "type": "CWE"
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      "providerMetadata": {
        "dateUpdated": "2026-06-01T16:38:46.470Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-qqgv-fqwp-mjpp",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-qqgv-fqwp-mjpp"
        },
        {
          "name": "https://github.com/nextcloud/user_oidc/pull/1285",
          "tags": [
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          "url": "https://github.com/nextcloud/user_oidc/pull/1285"
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        {
          "name": "https://hackerone.com/reports/3489490",
          "tags": [
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          "url": "https://hackerone.com/reports/3489490"
        }
      ],
      "source": {
        "advisory": "GHSA-qqgv-fqwp-mjpp",
        "discovery": "UNKNOWN"
      },
      "title": "Nextcloud: Authentication Bypass in ID4me handling via Missing JWT Signature Verification in User OIDC"
    }
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  "cveMetadata": {
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    "datePublished": "2026-06-01T16:38:46.470Z",
    "dateReserved": "2026-05-08T20:44:38.964Z",
    "dateUpdated": "2026-06-03T03:55:47.564Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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