Splunk Enterprise flaw lets low-privilege users run OS commands
A high-severity vulnerability in Splunk Enterprise allows users without admin roles to execute arbitrary operating system commands on search head cluster members.
Key points
- CVE-2026-76298 affects Splunk Enterprise versions below 10.4.4 and 10.2.8.
- The flaw allows derivation of the PostgreSQL sidecar database superuser password.
- Attackers can run arbitrary OS commands as the Splunk Enterprise service account.
Splunk Enterprise contains a high-severity vulnerability that permits users without administrative privileges to execute arbitrary operating system commands. This flaw affects versions prior to 10.4.4 and 10.2.8, exposing search head cluster members to potential compromise by lower-tier users.
What happened
According to the National Vulnerability Database, CVE-2026-76298 carries a CVSS score of 8.8, classifying it as high severity. The issue stems from how the PostgreSQL sidecar service handles credential generation within Splunk Enterprise environments. Specifically, the service derives a privileged database password from the search head cluster identifier.
This identifier appears in search job logs, making it accessible to users who do not hold the "admin" or "power" roles. By extracting this information, an attacker can obtain the superuser password for the PostgreSQL sidecar database. This access bypasses standard role-based access controls intended to limit user capabilities.
The vulnerability is linked to CWE-321, which relates to the generation of insecure cryptographic keys or secrets. The exposure occurs because the secret material is derived from data that is not sufficiently protected from non-privileged users. Consequently, the boundary between database access and operating system control is breached.
Why it matters
Once an attacker acquires the PostgreSQL superuser password, they can run arbitrary operating system commands. These commands execute as the user account running Splunk Enterprise on the affected search head cluster members. This effectively grants the attacker local system access equivalent to the service account's privileges.
The impact is significant because it allows execution of commands by users who lack admin or power roles. Users who previously relied on role separation to limit damage from compromised accounts now face a direct path to system-level execution. The flaw permits unauthorized command execution on search head cluster members.
What to watch
- Monitor search job logs for unusual access patterns by non-admin users.
- Check for unexpected operating system command execution on search heads.
- Verify that PostgreSQL sidecar credentials are not exposed in log outputs.
- Review role assignments to ensure least-privilege principles are enforced.
Who needs to act first
Teams should prioritize updating search head cluster members that are exposed to internal networks. Organizations must verify which versions of Splunk Enterprise are currently deployed across their infrastructure. It is advisable to test updates in a non-production environment before rolling them out widely. Backing up configurations ensures recovery options if the update process encounters issues.
Background: CVSS score
The CVSS score explains vulnerability severity using a 0.0 to 10.0 scale. It measures attack vector, complexity, privileges required, and impact on confidentiality, integrity, and availability. You use this metric to prioritize patches, though you must adjust it for your specific environment to avoid wasting time on irrelevant threats.
Read the full guide: CVSS Score Explained: How to Read Risk Metrics and Prioritize Fixes
What to do and how to stay safe: Splunk
- Identify all Splunk Enterprise instances running versions below 10.4.4 or 10.2.8.
- Restrict network access to search head clusters to limit exposure to untrusted users.
- Audit user roles to ensure no unnecessary privileges are granted to standard accounts.
- Monitor system logs for signs of unauthorized command execution or credential extraction.
Step-by-step guide: Virtual Patching Myths: What It Actually Fixes and Breaks
General security guidance from the Patch Gazette newsroom. It is not confirmed advice from the organisations named in this story.
Frequently asked questions
Which Splunk Enterprise versions are affected by CVE-2026-76298?
Versions below 10.4.4 and versions below 10.2.8 are affected by this vulnerability.
What can an attacker do with this vulnerability?
An attacker can derive the PostgreSQL sidecar database superuser password and run arbitrary operating system commands.
Is there a fix available for CVE-2026-76298?
The source material does not confirm the availability of a patch or update for this vulnerability.
