CVE-2026-1707: pgAdmin Restore Feature Flaw Opens Door to Host Command Execution via Restriction Bypass

CVE-2026-1707

CVE ID: CVE-2026-1707
Product: pgAdmin (pgAdmin 4)
Affected Version: 9.11
Vulnerability Type: Restore Restriction Bypass leading to Command Execution
Severity: High
CVSS v3.x Score: 7.4 (High)
Attack Vector: Network
Privileges Required: Low
User Interaction: None
Scope: Changed
Exploitability: Practical under specific conditions
Exploit Availability: No verified public exploit code; exploitation details are known conceptually and discussed for educational and defensive purposes only

Vulnerability Overview

A restore restriction bypass vulnerability was present in pgAdmin version 9.11 when operating in server mode and performing database restores using PLAIN-format dump files. During the restore workflow, pgAdmin attempts to enforce safety by restricting certain psql meta-commands through a temporary restriction mechanism.

Due to a design flaw in how this restriction was implemented, the secret restriction key generated during the restore process could be exposed in real time. In addition, a race condition existed that allowed the temporary restore script to be modified while the restore was still in progress. By combining these two weaknesses, the restore restrictions could be disabled mid-operation.

Once restrictions were bypassed, normally blocked meta-commands could be executed, resulting in arbitrary command execution on the host system where pgAdmin was running.

Technical Details

During a PLAIN-format restore, pgAdmin generates a temporary script that is passed to psql. A special internal restriction key is embedded to prevent execution of dangerous meta-commands.

The following weaknesses were identified:

The restriction key was observable during execution instead of being fully protected.
The temporary restore script could be overwritten during a narrow time window while the restore process was active.
No integrity validation was performed on the restore script after creation.

As a result, restore commands could be altered to re-enable meta-commands, which are capable of interacting with the operating system. This behavior allowed system-level commands to be executed with the privileges of the pgAdmin service account.

Conditions Required for Exploitation

The following conditions were required for successful exploitation:

pgAdmin was running in server mode.
The vulnerable version (9.11) was in use.
A PLAIN-format database restore was initiated through the pgAdmin interface.
The attacker had access to the pgAdmin environment sufficient to monitor or interfere with the restore operation.
The host filesystem allowed modification of temporary restore files during execution.

Exploitation Details (Educational)

Exploitation was achieved by monitoring the restore operation to capture the restriction key and then racing to overwrite the restore script before completion. By injecting commands that removed or neutralized the restriction, psql meta-commands became active again.

These meta-commands could then be used to invoke shell commands or manipulate files on the underlying operating system. No fully automated public proof-of-concept exploit was identified; however, the exploitation method was technically feasible and repeatable under controlled conditions.

This information is provided strictly for defensive awareness, validation, and detection engineering.

Impact

If successfully exploited, the vulnerability could result in:

Arbitrary command execution on the pgAdmin host
Unauthorized access to system resources
Potential data exposure or modification
Service disruption or further compromise of the hosting environment

The overall impact depended on the privileges under which pgAdmin was running.

MITRE ATT&CK Mapping

TA0001 – Initial Access: Abuse of application restore functionality
TA0002 – Execution: Execution of system commands via re-enabled meta-commands
T1059 – Command and Scripting Interpreter
T1078 – Valid Accounts (when authenticated access was required)

Detection Strategy

Detection focused on identifying abnormal restore behavior, unexpected file modifications, and command execution during database restore operations.

Relevant Log Sources

pgAdmin application logs
Web server or reverse proxy logs used by pgAdmin
Host operating system audit logs
File integrity monitoring logs
Process creation and execution logs
Database server logs related to restore activity

Detection Rules and Queries

Splunk – Suspicious Restore Keywords

index=pgadmin_logs
("restrict" OR "unrestrict")
| stats count by host, _time, message

Splunk – Restore and File Modification Correlation

index=os_logs
(file_path="*pgadmin*" AND action=modified)
| join host [ search index=pgadmin_logs "restore" ]
| table host, _time, file_path, user, process

Elastic / KQL – Restore Script Tampering

file.path : "*pgadmin*" and file.action : "modified"
and process.name : ("psql" or "pg_restore")

Linux Audit – Execution During Restore Window

Monitor execve system calls originating from psql or pg_restore
Correlate with recent writes to pgAdmin temporary directories

Indicators of Compromise

Unexpected modification of temporary restore scripts
Command execution events coinciding with restore operations
Presence of restricted meta-command strings in logs
Abnormal restore duration or failure patterns

Remediation and Mitigation

The vulnerability was addressed by strengthening restore restriction handling and eliminating the race condition that allowed script modification.

Official Patch / Upgrade

The issue was fixed in pgAdmin version 9.12 and later.

Official upgrade link:
https://www.pgadmin.org/docs/pgadmin4/9.12/release_notes_9_12.html

Upgrading to the patched version was the only complete remediation. Temporary workarounds were not considered sufficient due to the nature of the flaw.

Security Recommendations

Upgrade pgAdmin to the latest supported version immediately.
Restrict access to pgAdmin server mode interfaces.
Avoid PLAIN-format restores from untrusted sources.
Enable centralized logging and correlation for restore operations.
Run pgAdmin with the least privileges required.

Final Takeaway

CVE-2026-1707 represented a serious flaw in pgAdmin 9.11 that allowed restore safeguards to be bypassed, leading to command execution on the host system. While exploitation required specific conditions, the impact was significant. Proper patching, monitoring, and access control were essential to mitigate the risk and prevent abuse of restore functionality.