CVE-2026-20265: Splunk AI Toolkit SSRF Vulnerability

CVE-2026-20265 Overview

CVE-2026-20265 affects Splunk AI Toolkit versions below 5.7.4. The vulnerability allows a low-privileged Splunk user, who does not hold the admin or power roles, to trigger outbound HTTP requests from the Splunk AI Toolkit to an attacker-controlled server. This behavior enables potential data exfiltration through the AI agent functionality. The root cause is an insecure default domain allowlist that fails to restrict outbound AI agent requests to approved external domains. The issue is categorized under [CWE-1188] (Insecure Default Initialization of Resource).

Critical Impact
A low-privileged authenticated user can coerce the Splunk AI Toolkit into sending outbound HTTP requests to attacker-controlled infrastructure, enabling data exfiltration through AI agent functionality.

Affected Products

Splunk AI Toolkit versions below 5.7.4

Discovery Timeline

2026-06-17 - CVE-2026-20265 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2026-20265

Vulnerability Analysis

The Splunk AI Toolkit ships with a permissive default domain allowlist for outbound AI agent requests. The allowlist does not constrain destinations to approved external domains. As a result, AI agent workflows can issue HTTP requests to arbitrary hosts on the internet. A low-privileged Splunk user without admin or power roles can leverage this behavior to direct requests at infrastructure they control. Because the requests originate from the Splunk server, sensitive data passed through the AI agent can be transmitted off-premises. The vulnerability is classified as an information disclosure issue resulting from insecure default configuration.

Root Cause

The insecure default initialization of the domain allowlist [CWE-1188] is the underlying cause. The toolkit treats outbound AI agent destinations as broadly trusted by default, rather than enforcing a restrictive allowlist that administrators must explicitly extend. This design choice removes the egress boundary that should isolate AI agent traffic from arbitrary internet destinations.

Attack Vector

The attack requires network access to the Splunk instance and a low-privileged authenticated account. The attacker invokes Splunk AI Toolkit functionality that performs outbound HTTP requests as part of AI agent operation. By influencing the target URL or supplying content routed to the AI agent, the attacker causes the toolkit to contact a server they control over HTTP. Data handled by the AI agent can then be captured at the attacker endpoint.

No verified public exploit code is available. For technical specifics, refer to the Splunk Security Advisory SVD-2026-0613.

Detection Methods for CVE-2026-20265

Indicators of Compromise

Outbound HTTP connections from Splunk hosts to domains not associated with legitimate Splunk AI Toolkit operations.
Splunk audit logs showing AI agent invocations by users lacking admin or power roles.
Unexpected DNS resolutions originating from Splunk servers to recently registered or low-reputation domains.

Detection Strategies

Monitor proxy and firewall logs for HTTP egress from Splunk infrastructure and correlate destinations against the configured AI Toolkit allowlist.
Review Splunk internal logs for AI Toolkit agent activity initiated by non-privileged accounts.
Alert on cleartext HTTP egress from Splunk hosts, which should be uncommon in hardened environments.

Monitoring Recommendations

Baseline normal outbound destinations for the Splunk AI Toolkit and alert on deviations.
Track per-user AI Toolkit usage volume and flag accounts that suddenly begin invoking agent workflows.
Forward Splunk audit and _internal index events to a centralized SIEM for cross-correlation with network egress telemetry.

How to Mitigate CVE-2026-20265

Immediate Actions Required

Upgrade the Splunk AI Toolkit to version 5.7.4 or later on all Splunk instances where it is installed.
Audit Splunk role assignments and remove unnecessary access to AI Toolkit functionality from low-privileged accounts.
Review recent outbound HTTP traffic from Splunk hosts for evidence of unauthorized exfiltration.

Patch Information

Splunk has addressed the vulnerability in Splunk AI Toolkit version 5.7.4. Administrators should apply the update following guidance in the Splunk Security Advisory SVD-2026-0613.

Workarounds

Restrict the AI Toolkit's domain allowlist to only the external services explicitly required by the deployment.
Enforce egress filtering at the network perimeter so that Splunk hosts can only reach approved AI service endpoints.
Limit Splunk AI Toolkit usage to users holding the admin or power roles until the patch is applied.

bash

# Configuration example: restrict egress from Splunk hosts at the firewall
# Replace allowed.example.com with the approved AI service endpoints
iptables -A OUTPUT -p tcp -d allowed.example.com --dport 443 -j ACCEPT
iptables -A OUTPUT -p tcp --dport 80 -j DROP
iptables -A OUTPUT -p tcp --dport 443 -j DROP