CVE-2026-7816: pgAdmin 4 RCE Vulnerability Explained

CVE-2026-7816 Overview

CVE-2026-7816 is an OS command injection vulnerability [CWE-78] in the pgAdmin 4 Import/Export query export feature. User-supplied input is interpolated directly into a psql \copy metacommand template without sanitization. Authenticated attackers can break out of the \copy (...) context and execute arbitrary operating system commands on the pgAdmin server. The same flaw also allows arbitrary file writes through TO '/path' constructs. Additional fields including format, on_error, and log_verbosity are also raw-interpolated and exploitable. The issue affects pgAdmin 4 versions before 9.15.

Critical Impact

Authenticated users can achieve arbitrary command execution and arbitrary file write on the pgAdmin server, leading to full host compromise.

Affected Products

• pgAdmin 4 versions prior to 9.15
• pgAdmin 4 Import/Export query export component
• Deployments exposing pgAdmin 4 to authenticated multi-tenant users

Discovery Timeline

• 2026-05-11 - CVE-2026-7816 published to NVD
• 2026-05-13 - Last updated in NVD database

Technical Details for CVE-2026-7816

Vulnerability Analysis

The vulnerability resides in pgAdmin 4's Import/Export query export workflow. The application constructs a psql \copy metacommand by embedding user-controlled values directly into the template string. Because \copy supports a TO PROGRAM 'cmd' clause that pipes results into an arbitrary shell command, an authenticated attacker can close the parenthesized query expression and append a TO PROGRAM directive. The injected command then runs under the privileges of the pgAdmin server process.

An alternate exploitation path uses TO '/path' to write attacker-controlled output to any file path the pgAdmin process can access. This enables persistence through configuration file overwrites, SSH key planting, or web shell deployment in served directories.

Root Cause

The root cause is missing input sanitization and missing structural validation when building the \copy metacommand. The query string and the format, on_error, and log_verbosity parameters are concatenated into the command template as raw text. No parser tracks parenthesis balance, no allow-list constrains enumeration parameters, and null bytes are not rejected. This permits attackers to escape the intended SQL COPY query context.

Attack Vector

Exploitation requires an authenticated session on the pgAdmin 4 server. The attacker submits a crafted query export request where the query body terminates the \copy (...) parenthesized expression and appends TO PROGRAM 'cmd'. The injected payload is forwarded to psql, which executes the program clause on the server hosting pgAdmin. Because the attack surface is reachable over the network and the parameters used are functional pgAdmin features, no unusual privilege or user interaction is required beyond standard authenticated access. Refer to the GitHub Issue Report for technical context.

Detection Methods for CVE-2026-7816

Indicators of Compromise

• Unexpected child processes spawned by the pgAdmin 4 Python process or psql binary, particularly shell interpreters, curl, wget, or scripting runtimes
• pgAdmin server logs containing \copy metacommands with TO PROGRAM clauses or unexpected TO '/path' constructs
• New or modified files in pgAdmin-writable directories not corresponding to legitimate export operations
• Outbound network connections originating from the pgAdmin host immediately following Import/Export operations

Detection Strategies

• Monitor process ancestry for psql or pgAdmin processes spawning interactive shells, /bin/sh, cmd.exe, or PowerShell
• Inspect pgAdmin Import/Export request payloads for parenthesis imbalance, embedded null bytes, or non-allow-listed values in format, on_error, and log_verbosity
• Audit filesystem write activity by the pgAdmin service account against an allow-list of legitimate export destinations

Monitoring Recommendations

• Forward pgAdmin application logs and host process telemetry to a centralized analytics platform and alert on TO PROGRAM strings
• Track authenticated session activity on pgAdmin for anomalous Import/Export operation volume or off-hours usage
• Baseline expected outbound connections from the pgAdmin host and alert on deviations following query export events

How to Mitigate CVE-2026-7816

Immediate Actions Required

• Upgrade pgAdmin 4 to version 9.15 or later, which adds a parenthesis-balance parser, allow-lists enumeration parameters, and rejects null bytes in queries
• Restrict network access to pgAdmin 4 management interfaces to trusted administrative networks only
• Audit pgAdmin user accounts and remove unnecessary authenticated access
• Review pgAdmin host logs for evidence of TO PROGRAM or unexpected file write activity prior to patching

Patch Information

The upstream fix is included in pgAdmin 4 version 9.15. The patch introduces a parser modeled on psql's strtokx tokenizer to enforce parenthesis balance, applies allow-lists to the format, on_error, and log_verbosity fields, rejects null bytes in the query body, and tightens type and gating checks. Details are tracked in the pgAdmin GitHub Issue.

Workarounds

• Run pgAdmin 4 under a least-privileged service account with no write access to sensitive paths and no shell available
• Disable or restrict the Import/Export query export functionality for non-administrative users where feasible
• Place pgAdmin behind a reverse proxy that filters request bodies containing TO PROGRAM or unbalanced parentheses in export parameters

# Configuration example: verify installed pgAdmin 4 version and upgrade via pip
pip show pgadmin4 | grep -i version
pip install --upgrade "pgadmin4>=9.15"