What is CVE-2026-20138?
In Splunk Enterprise versions below 10.2.0, 10.0.2, 9.4.7, 9.3.9, and 9.2.11, a user of a Splunk Search Head Cluster (SHC) deployment who holds a role with access to the Splunk `_internal` index could view the `integrationKey`, `secretKey`, and `appSecretKey` secrets, generated by [Duo Two-Factor Authentication for Splunk Enterprise](https://duo.com/docs/splunk), in plain text.
The record classifies CVE-2026-20138 under weakness class CWE-532. Its CVSS v3 base vector states that the flaw is reachable from an adjacent network, needs high-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 234 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 6.8 — MEDIUM
CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - EPSS (FIRST)
- 0.3% probability of exploitation in the next 30 days, higher than 21.7% of all scored CVEs
- CISA KEV
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Threadlinqs priority
- 4.3/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- Published
- 2026-02-18, last modified 2026-02-26
Is CVE-2026-20138 being exploited?
It currently carries a trending score of 10 in the Threadlinqs vulnerability feed.
Affected products and versions
- Splunk: Enterprise
How to fix CVE-2026-20138
No vendor patch reference has been recorded for CVE-2026-20138 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.
Threat activity tracking CVE-2026-20138
1 tracked threat in the Threadlinqs corpus references CVE-2026-20138, either in the campaign’s CVE list or as an indicator on the campaign record.
Sources
Enriched from CVE.org, FIRST EPSS. Last verified by Threadlinqs on .