Security readout for executives and security teams
Plain-English summary
CVE-2026-20142 affects Splunk Enterprise Search Head Cluster deployments. A highly privileged user with access to the `_internal` index could view an RSA `accessKey` from `authentication.conf` in plain text. This is an insider or compromised-account risk, not a public unauthenticated exposure based on the provided sources.
Executive priority
Prioritize remediation for Splunk Search Head Clusters with broad `_internal` access or many privileged users. Treat this as a moderate but meaningful confidentiality risk because exposed secrets may enable further compromise if obtained by an authorized or compromised account.
Technical view
Splunk Enterprise versions below 10.2.0, 10.0.2, 9.4.7, 9.3.9, and 9.2.11 are affected. The issue is CWE-532: sensitive information written to logs or an internal index. CVSS 3.1 is 6.8 with AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.
Likely exposure
Exposure is most likely in Splunk Enterprise Search Head Cluster environments where roles grant access to the `_internal` index. Risk increases if many administrators, power users, or service accounts can search `_internal`. Non-SHC deployments are not described as affected in the provided description.
Exploitation context
The provided sources do not indicate active exploitation, and the CVE is not listed as KEV in the bundle. Exploitation requires an authenticated user with a role that can access `_internal`, so the main threat is a malicious insider or compromised privileged Splunk account.
Researcher notes
The vulnerability is bounded by deployment type and privileges: SHC plus `_internal` index access. The sources name fixed version thresholds but do not provide exploit details or evidence of exploitation. Validate access-control assumptions before rating local risk.
Mitigation direction
- Upgrade affected Splunk Enterprise versions to 10.2.0, 10.0.2, 9.4.7, 9.3.9, 9.2.11, or later.
- Restrict `_internal` index access to roles with a clear operational need.
- Review Splunk advisory SVD-2026-0207 for any environment-specific guidance.
- If exposure is confirmed, follow Splunk guidance for key or credential handling.
Validation and detection
- Inventory Splunk Enterprise Search Head Cluster deployments and versions.
- Identify roles and users with access to the `_internal` index.
- Confirm affected systems are upgraded to a fixed version or later.
- Assess whether the RSA `accessKey` appeared in `_internal` data.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-532: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-20142 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H0.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.8MediumVector: CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://advisory.splunk.com/advisories/SVD-2026-0207CVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Insertion of Sensitive Information into Log File
Insertion of Sensitive Information into Log File represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.