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pgAdmin 4 Database Management Tool Patches Multiple Vulnerabilities in Version 9.18

The development team behind pgAdmin 4, the popular management tool for PostgreSQL databases, has released version 9.18 to address multiple security issues. The update, published on September 17, 2026, includes fixes for four CVEs along with 29 total changes covering new features and bug resolutions. One vulnerability, tracked as CVE-2026-86863, stems from insufficient web server authentication that trusts external HTTP headers, enabling attackers to bypass login and impersonate administrators without passwords. A second issue, CVE-2026-86864, allows command injection through the backup feature when database names are passed as arguments, potentially leading to unauthorized file writes or exfiltration of connection passwords. The update is available now from the official pgAdmin repository.

Security NEXTTranslated from Japanese

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The development team for the PostgreSQL management tool pgAdmin 4 has released version 9.18 to address multiple vulnerabilities. The security update was published on September 17, 2026, and resolves four CVEs while delivering 29 total changes that also include new features and bug fixes.

One of the corrected issues, CVE-2026-86863, arises from improper web server authentication. The application trusts HTTP headers supplied by external sources, which can allow authentication bypass when user information cannot be retrieved from the web server. Attackers can supply an arbitrary username and gain administrative privileges without providing a password.

A second vulnerability, CVE-2026-86864, affects the backup functionality. Database names are processed as command-line arguments, creating a command injection risk. Although exploitation requires authentication, successful attacks can write files outside the intended storage area or redirect connections to exfiltrate database credentials to attacker-controlled systems.

Users are strongly encouraged to upgrade to pgAdmin 4 9.18 immediately. The updated release is available through the official GitHub repository maintained by the pgadmin-org project.

PostgreSQLpgAdmin 4CVE-2026-86863CVE-2026-86864
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