{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "source": "REFERENCES"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "e7a85767314e7b0fe0b35fe80b9c1af38f48dff6"
            },
            {
              "fixed": "ea7e798aac27174d2bacee1d6e136bed76a95e23"
            }
          ],
          "repo": "https://github.com/pgadmin-org/pgadmin4",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "PostgreSQL",
    "cwe_ids": [
      "CWE-78",
      "CWE-88"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/17xxx/CVE-2026-17347.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "7.2"
          },
          {
            "fixed": "9.17"
          }
        ],
        "source": "AFFECTED_FIELD"
      },
      {
        "extracted_events": [
          {
            "introduced": "7.2"
          },
          {
            "fixed": "9.17"
          }
        ],
        "source": "DESCRIPTION"
      }
    ]
  },
  "details": "The MASTER_PASSWORD_HOOK setting, introduced in pgAdmin 4 7.2, lets an administrator configure an external command that returns a per-user encryption key, with %u in the configured string replaced by the current user's name. The previous implementation substituted the username directly into the command string and executed the result with subprocess.Popen(..., shell=True). Because the username can originate from an external authentication source (OAuth/OIDC claims, Kerberos, webserver auth) rather than a value pgAdmin fully controls, a username containing shell metacharacters (';', '$()', backticks, pipes, '\u0026\u0026', newlines) allowed an authenticated user to execute arbitrary commands as the pgAdmin service account in any deployment where the configured hook string uses %u.\n\nFix tokenises the trusted, administrator-configured hook string into an argument vector first (using shlex in POSIX-quoting mode, with backslash-escaping disabled so Windows-style paths are not mis-parsed), substitutes the untrusted username into the individual argv elements, and executes with shell=False. The username is therefore always confined to a single argv element; any shell metacharacters it contains are inert. Administrators whose MASTER_PASSWORD_HOOK previously relied on shell features (pipes, redirection, environment-variable expansion, globbing) within the hook string itself must move that logic into the invoked script, since it is no longer interpreted by a shell.\n\nThis issue affects pgAdmin 4: from 7.2 before 9.17.",
  "id": "CVE-2026-17347",
  "modified": "2026-08-02T03:32:13.824571108Z",
  "published": "2026-07-31T15:59:16.588Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/17xxx/CVE-2026-17347.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-17347"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/pgadmin-org/pgadmin4/issues/10191"
    },
    {
      "type": "FIX",
      "url": "https://github.com/pgadmin-org/pgadmin4/commit/e7a85767314e7b0fe0b35fe80b9c1af38f48dff6"
    },
    {
      "type": "FIX",
      "url": "https://github.com/pgadmin-org/pgadmin4/commit/ea7e798aac27174d2bacee1d6e136bed76a95e23"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/pgadmin-org/pgadmin4"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "pgAdmin 4: OS command injection in MASTER_PASSWORD_HOOK via untrusted username substitution"
}