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CVE-2026-20165: Sensitive Information Disclosure in MongoClient logging channel in Splunk Enterprise

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-11 · updated 2026-06-17
• Weakness: CWE-532

Description

In Splunk Enterprise versions below 10.2.1, 10.0.4, 9.4.9, and 9.3.10, and Splunk Cloud Platform versions below 10.2.2510.7, 10.1.2507.17, 10.0.2503.12, and 9.3.2411.124, a low-privileged user that does not hold the "admin" or "power" Splunk roles could retrieve sensitive information by inspecting the job's search log due to improper access control in the MongoClient logging channel.

Affected products

• Splunk Enterprise: from 9.3.0 before 9.3.10; from 9.4.0 before 9.4.9; from 10.0.0 before 10.0.4; 10.2.0 — fixed in 10.0.4, 9.3.10, 9.4.9
• Splunk Cloud Platform: from 9.3.2411 before 9.3.2411.124; from 10.0.2503 before 10.0.2503.12; from 10.1.2507 before 10.1.2507.17; from 10.2.2510 before 10.2.2510.7 — fixed in 10.0.2503.12, 10.1.2507.17, 10.2.2510.7, 9.3.2411.124

How to fix

Upgrade to a fixed version: Splunk Enterprise 10.0.4, 9.3.10, 9.4.9; Splunk Cloud Platform 10.0.2503.12, 10.1.2507.17, 10.2.2510.7, 9.3.2411.124. Check the vendor advisory for mitigations.

References

• https://advisory.splunk.com/advisories/SVD-2026-0304

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