Splunk Enterprise lacked TLS cert validation for Splunk-to-Splunk communication by default

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

• splunk splunkbefore 9.0
• splunk splunk cloud platformbefore 8.2.2203

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Splunk). Independent of NVD's CPE analysis and usually ahead of it.

• Splunk Splunk Cloud Platform

  • 8.2 and later · before 8.2.2203affected

• Splunk Splunk Enterprise

  • 9.0 and later · before 9.0affected

Other highest-scoring records for the same primary product.

• CVE-2026-20253Unauthenticated Arbitrary File Creation and Truncation in a PostgreSQL Sidecar Service Endpoint in Splunk EnterpriseKEV
  98Now
• CVE-2018-11409Splunk through 7.0.1 allows information disclosure by appending __raw/services/server/info/server-info?output_mode=json to a query, as demon
  60This week
• CVE-2023-32707‘edit_user’ Capability Privilege Escalation
  59Plan

Published before and after this one in the same product

• ← EarlierCVE-2022-27183May 6, 2022 · Reflected XSS in a query parameter of the Monitoring Console
  24Monitor
• ← EarlierCVE-2022-32151Jun 15, 2022 · Splunk Enterprise disabled TLS validation using the CA certificate stores in Python 3 libraries by default
  36Monitor
• Later →CVE-2022-32153Jun 15, 2022 · Splunk Enterprise lacked TLS host name validation
  32Monitor

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Root cause

A certificate validation error is silently swallowed instead of terminating the connection. Often, code added for a test environment makes its way into production.

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

1override fun checkServerTrusted(chain: Array<X509Certificate>, type: String) {2  // Left empty for the test environment3}

1val client = OkHttpClient.Builder()2  .certificatePinner(3    CertificatePinner.Builder()4      .add("api.sirius.example", "sha256/…")5      .build()6  ).build()

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.