CVE-2026-87004 (GCVE-0-2026-87004)
Vulnerability from cvelistv5
Published
2026-09-30 17:01
Modified
2026-09-30 18:01
Severity ?
8.1 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Summary
Tugtainer is a self-hosted app for automating updates of Docker containers. Prior to version 1.31.3, when the OIDC login flow completes, backend/modules/auth/providers/auth_oidc_provider.py decodes the id_token returned by the identity provider's token endpoint using jose.jwt.get_unverified_claims() instead of jwt.decode(). This skips signature verification, audience (aud) validation, issuer (iss) validation, and expiry (exp) checking entirely. The extracted claims (email/sub/preferred_username) are then used directly as the user_id for the resulting Tugtainer session. This issue has been patched in version 1.31.3.
References
Impacted products
Vendor Product Version
Quenary tugtainer Version: < 1.31.3
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      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-87004",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-30T18:00:13.050961Z",
                "version": "2.0.3"
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        "providerMetadata": {
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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            "url": "https://github.com/Quenary/tugtainer/security/advisories/GHSA-crjc-6vc7-xrfh"
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        "title": "CISA ADP Vulnrichment"
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    ],
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          "vendor": "Quenary",
          "versions": [
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            }
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      ],
      "descriptions": [
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          "value": "Tugtainer is a self-hosted app for automating updates of Docker containers. Prior to version 1.31.3, when the OIDC login flow completes, backend/modules/auth/providers/auth_oidc_provider.py decodes the id_token returned by the identity provider\u0027s token endpoint using jose.jwt.get_unverified_claims() instead of jwt.decode(). This skips signature verification, audience (aud) validation, issuer (iss) validation, and expiry (exp) checking entirely. The extracted claims (email/sub/preferred_username) are then used directly as the user_id for the resulting Tugtainer session. This issue has been patched in version 1.31.3."
        }
      ],
      "metrics": [
        {
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            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
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      ],
      "problemTypes": [
        {
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              "lang": "en",
              "type": "CWE"
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      "providerMetadata": {
        "dateUpdated": "2026-09-30T17:01:24.963Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
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          "tags": [
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          "url": "https://github.com/Quenary/tugtainer/security/advisories/GHSA-crjc-6vc7-xrfh"
        },
        {
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          "tags": [
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          "tags": [
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          "url": "https://github.com/Quenary/tugtainer/releases/tag/v1.31.3"
        }
      ],
      "source": {
        "advisory": "GHSA-crjc-6vc7-xrfh",
        "discovery": "UNKNOWN"
      },
      "title": "Tugtainer: OIDC id_token claims accepted without signature/audience/expiry verification"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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    "datePublished": "2026-09-30T17:01:24.963Z",
    "dateReserved": "2026-09-08T16:44:23.782Z",
    "dateUpdated": "2026-09-30T18:01:20.063Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-87004\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-09-30T18:00:13.050961Z\"}}}], \"references\": [{\"url\": \"https://github.com/Quenary/tugtainer/security/advisories/GHSA-crjc-6vc7-xrfh\", \"tags\": [\"exploit\"]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-09-30T18:00:24.758Z\"}}], \"cna\": {\"title\": \"Tugtainer: OIDC id_token claims accepted without signature/audience/expiry verification\", \"source\": {\"advisory\": \"GHSA-crjc-6vc7-xrfh\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 8.1, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"HIGH\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"HIGH\"}}], \"affected\": [{\"vendor\": \"Quenary\", \"product\": \"tugtainer\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003c 1.31.3\"}]}], \"references\": [{\"url\": \"https://github.com/Quenary/tugtainer/security/advisories/GHSA-crjc-6vc7-xrfh\", \"name\": \"https://github.com/Quenary/tugtainer/security/advisories/GHSA-crjc-6vc7-xrfh\", \"tags\": [\"x_refsource_CONFIRM\"]}, {\"url\": \"https://github.com/Quenary/tugtainer/commit/b55269b6a3bfd43b0f2f5bd5f137ee0c81b7c2e4\", \"name\": \"https://github.com/Quenary/tugtainer/commit/b55269b6a3bfd43b0f2f5bd5f137ee0c81b7c2e4\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/Quenary/tugtainer/releases/tag/v1.31.3\", \"name\": \"https://github.com/Quenary/tugtainer/releases/tag/v1.31.3\", \"tags\": [\"x_refsource_MISC\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"Tugtainer is a self-hosted app for automating updates of Docker containers. Prior to version 1.31.3, when the OIDC login flow completes, backend/modules/auth/providers/auth_oidc_provider.py decodes the id_token returned by the identity provider\u0027s token endpoint using jose.jwt.get_unverified_claims() instead of jwt.decode(). This skips signature verification, audience (aud) validation, issuer (iss) validation, and expiry (exp) checking entirely. The extracted claims (email/sub/preferred_username) are then used directly as the user_id for the resulting Tugtainer session. This issue has been patched in version 1.31.3.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-347\", \"description\": \"CWE-347: Improper Verification of Cryptographic Signature\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2026-09-30T17:01:24.963Z\"}}}",
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}


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