CVE-2026-82028: Magistrala SQL Injection Vulnerability

CVE-2026-82028 Overview

CVE-2026-82028 is a SQL injection vulnerability in Magistrala versions prior to 1.0.0. The flaw resides in the timescale-reader and postgres-reader HTTP API services. Authenticated attackers can inject arbitrary SQL by supplying a malicious format query parameter that is interpolated directly into the FROM clause without parameterization or identifier quoting. Because injected SQL executes with PostgreSQL superuser privileges under the default role configuration, exploitation extends far beyond data disclosure. The vulnerability is tracked under CWE-89 and was disclosed in the VulnCheck SQL Injection Advisory.

Critical Impact
Attackers with a self-registered account can read cross-tenant data, extract pg_shadow password hashes, read and write arbitrary files, and achieve remote code execution as the postgres OS user.

Affected Products

Magistrala timescale-reader service (versions before 1.0.0)
Magistrala postgres-reader service (versions before 1.0.0)
Magistrala IoT platform deployments running affected reader APIs

Discovery Timeline

2026-09-14 - CVE-2026-82028 published to NVD
2026-09-16 - Last updated in NVD database
Magistrala v1.0.0 - Fix released via GitHub Release v1.0.0 and GitHub Pull Request #3581

Technical Details for CVE-2026-82028

Vulnerability Analysis

Magistrala is an open-source IoT messaging and event-driven platform. The timescale-reader and postgres-reader microservices expose HTTP endpoints that query stored message data from PostgreSQL and TimescaleDB backends. Both services accept a format query parameter that determines which database table to read from. The parameter value is concatenated directly into the SQL statement's FROM clause. No parameter binding, allowlist validation, or identifier quoting is applied. Attackers can therefore replace the table reference with arbitrary subqueries and escalate a read query into full database control.

Root Cause

The defect is a classic string-concatenation SQL injection [CWE-89]. The format parameter is trusted as a table identifier and inlined into the query text before submission to the database driver. PostgreSQL's driver treats the resulting string as trusted SQL. Compounding the impact, the Magistrala reader services connect to PostgreSQL using an account with superuser privileges, which is the default role configuration. Any injected statement therefore executes with unrestricted database authority.

Attack Vector

An attacker registers a Magistrala account through the self-service registration endpoint. Using the resulting bearer token, the attacker issues a request to a reader endpoint and supplies a crafted format value. Substituting a subquery allows reads across tenant boundaries, bypassing Magistrala's message isolation model. Escalation paths documented in the VulnCheck SQL Injection Advisory include extracting pg_shadow password hashes, using COPY ... FROM PROGRAM or lo_export for arbitrary file read and write, and loading attacker-supplied shared objects with CREATE FUNCTION to execute code as the postgres OS user.

Refer to the GitHub Pull Request Changes #3581 for the exact code paths that constructed the vulnerable query string.

Detection Methods for CVE-2026-82028

Indicators of Compromise

Requests to timescale-reader or postgres-reader endpoints containing SQL keywords such as SELECT, UNION, pg_shadow, COPY, or CREATE FUNCTION in the format query parameter.
PostgreSQL logs showing statements referencing system catalogs (pg_shadow, pg_authid, pg_proc) originating from the Magistrala reader service account.
Unexpected shared object files written to directories accessible by the postgres OS user.
Outbound network connections or new child processes spawned from the postgres process.

Detection Strategies

Enable PostgreSQL log_statement = 'all' on reader database instances and alert on non-parameterized queries containing suspicious identifiers.
Inspect HTTP access logs on reader services for format parameter values that are not in the expected allowlist of senml, json, or configured message tables.
Correlate self-registered account activity with reader API calls to surface reconnaissance patterns typical of tenant-boundary probing.

Monitoring Recommendations

Monitor the postgres process for unexpected file writes, dlopen-style behavior, and creation of new functions or extensions.
Track sudden spikes in reader API response sizes that may indicate bulk data exfiltration through injected UNION queries.
Alert on any query executed by the Magistrala database role that touches PostgreSQL system catalogs.

How to Mitigate CVE-2026-82028

Immediate Actions Required

Upgrade Magistrala to version 1.0.0 or later using the GitHub Release v1.0.0.
Rotate all PostgreSQL credentials, including any hashes potentially extracted from pg_shadow.
Audit self-registered accounts and revoke tokens issued to untrusted identities.
Inspect the PostgreSQL data directory and server filesystem for attacker-supplied shared objects or written files.

Patch Information

The fix is included in Magistrala 1.0.0 and delivered through GitHub Pull Request #3581. The patch validates the format parameter against an allowlist and removes direct string interpolation into the FROM clause. Review the patch diff to confirm coverage in your deployment.

Workarounds

Disable self-service account registration until the platform is upgraded.
Restrict the PostgreSQL role used by the reader services to a least-privilege account without superuser rights, COPY, or CREATE FUNCTION permissions.
Place a Web Application Firewall (WAF) rule in front of reader endpoints to reject format parameter values that are not in an explicit allowlist.
Network-segment the reader services and the PostgreSQL backend so exploited processes cannot reach sensitive internal systems.

bash

# Configuration example: restrict PostgreSQL role privileges for the reader services
REVOKE ALL ON DATABASE magistrala FROM magistrala_reader;
GRANT CONNECT ON DATABASE magistrala TO magistrala_reader;
GRANT USAGE ON SCHEMA public TO magistrala_reader;
GRANT SELECT ON messages, json_messages TO magistrala_reader;
ALTER ROLE magistrala_reader NOSUPERUSER NOCREATEDB NOCREATEROLE;