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CVE-2026-86864 (GCVE-0-2026-86864)

Vulnerability from cvelistv5 – Published: 2026-09-17 15:31 – Updated: 2026-09-17 16:00
VLAI
Title
pgAdmin 4: Argument and connection-string injection via the database field in the Backup tool
Summary
pgAdmin 4's Backup tool appended the client-supplied 'database' field from the /backup/job/<sid>/object request to the pg_dump argument vector as a bare trailing positional argument, without validation. Because pg_dump parses its options with getopt_long, which permutes arguments, a value beginning with a dash was interpreted as an option rather than as a database name. A value such as --file=/absolute/path therefore overrode the storage-confined --file that pgAdmin had constructed earlier, causing pg_dump to write its output anywhere the pgAdmin process could write, outside the user's File Manager storage directory. This yields arbitrary file creation and overwrite as the operating-system account running pgAdmin, which can destroy pgAdmin's own configuration database and, depending on the target chosen, be escalated further. The same field additionally permitted connection-string injection. libpq expands a database name containing an equals sign into a full connection string, and keywords embedded there override the --host and --port that pgAdmin passes, so a value such as 'host=attacker.example port=5432 dbname=x' redirected pg_dump to a server of the attacker's choosing. Because pgAdmin exports the decrypted stored database password in the PGPASSWORD environment variable before executing the utility, the redirected connection carries that credential to the attacker-nominated endpoint. Both behaviours are reachable by any authenticated user holding the tools_backup permission, which is granted to the default User role. The fix stops passing the database name through the argument vector altogether and supplies it in the PGDATABASE environment variable, which libpq treats as a literal database name and never expands as a connection string. This matches the approach already used by the Import/Export tool. Regression tests assert that the database name is absent from the constructed argument vector and that PGDATABASE carries the exact requested value. This issue affects pgAdmin 4: from the introduction of the trailing positional database argument in the Backup tool before 9.18.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-17 15:59 UTC
CWE
  • CWE-88 - Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')
  • CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
References
Impacted products
Vendor Product Version CPE status
pgadmin.org pgAdmin 4 Affected: 0 , < 9.18 (custom)
guessed Create a notification for this product.
Show details on NVD website

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            {
              "tags": [
                "issue-tracking"
              ],
              "url": "https://github.com/pgadmin-org/pgadmin4/issues/10384"
            }
          ],
          "source": {
            "discovery": "EXTERNAL"
          },
          "title": "pgAdmin 4: Argument and connection-string injection via the database field in the Backup tool"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "f86ef6dc-4d3a-42ad-8f28-e6d5547a5007",
        "assignerShortName": "PostgreSQL",
        "cveId": "CVE-2026-86864",
        "datePublished": "2026-09-17T15:31:00.492Z",
        "dateReserved": "2026-09-08T15:47:05.996Z",
        "dateUpdated": "2026-09-17T16:00:02.215Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Taxonomy of the tags.


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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Detection rules are retrieved from Rulezet.

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Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.


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