CVE-2026-20166 | Sensitive Information Disclosure in Discover Splunk Observability Cloud app for Splunk Enterprise

In Splunk Enterprise versions below 10.2.1 and 10.0.4, and Splunk Cloud Platform versions below 10.2.2510.5, 10.1.2507.16, and 10.0.2503.12, a low-privileged user that does not hold the "admin" or "power" Splunk roles could retrieve the Observability Cloud API access token through the Discover Splunk Observability Cloud app due to improper access control. This vulnerability does not affect Splunk Enterprise versions below 9.4.9 and 9.3.10 because the Discover Splunk Observability Cloud app does not come with Splunk Enterprise.

Published: 2026-03-11 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-20166 is rated Low Risk (23.4/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.15%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-20166

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.03% 0.15% +0.13%
2 2026-03-12 — 0.03% —

Full EPSS history (2 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-20166

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.4 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 2.5 [email protected]

Weakness enumeration for CVE-2026-20166

Affected software / configurations for CVE-2026-20166

Vendor Product Version Raw CPE
splunk splunk >= 10.0.0, < 10.0.4 cpe:2.3:a:splunk:splunk:*:*:*:*:enterprise:*:*:*
splunk splunk 10.2.0 cpe:2.3:a:splunk:splunk:10.2.0:*:*:*:enterprise:*:*:*
splunk splunk_cloud_platform >= 10.0.2503, < 10.0.2503.12 cpe:2.3:a:splunk:splunk_cloud_platform:*:*:*:*:*:*:*:*
splunk splunk_cloud_platform >= 10.1.2507, < 10.1.2507.16 cpe:2.3:a:splunk:splunk_cloud_platform:*:*:*:*:*:*:*:*
splunk splunk_cloud_platform >= 10.2.2510, < 10.2.2510.5 cpe:2.3:a:splunk:splunk_cloud_platform:*:*:*:*:*:*:*:*

References for CVE-2026-20166

cvelogic Threat Intelligence