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CVE-2026-76310 – Unauthenticated Session/Data Exposure via Embedded Report Tokens – Splunk Enterpris

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Summary

CVE-2026-76310 is a critical improper access control vulnerability in Splunk Enterprise that allows an unauthenticated attacker holding an embedded report token to download the associated search job dispatch archive and recover session material belonging to the report’s owner. This lets the attacker access all data available to that user, and if the report owner holds the Splunk "admin" role, perform administrative actions and affect system integrity. The vulnerability carries a CVSS v3.1 base score of 9.4 (Critical).

Technical details

  • Root cause: Embedded report access in Splunk Enterprise does not restrict REST API requests for downloading the search job dispatch archive tied to that report.
  • Trigger condition: An attacker only needs to possess a valid embedded report token (no additional authentication) to request the dispatch archive for the associated search job.
  • Attack vector: Network — the dispatch archive is retrieved via a REST API call, requiring no user interaction and low attack complexity.
  • Impact: Recovered session material from the archive can be used to impersonate the report owner, exposing all data accessible to that user; if the owner holds admin privileges, the attacker can perform administrative actions, resulting in high confidentiality and integrity impact and low availability impact.

Affected software

  • Splunk Enterprise 10.4, versions before 10.4.2
  • Splunk Enterprise 10.2, versions before 10.2.6
  • Splunk Enterprise 10.0, versions before 10.0.9
  • Splunk Enterprise 9.4, versions before 9.4.14

Severity

  • CVSS v3.1 Base Score: 9.4 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
  • CWE-284: Improper Access Control

Mitigation and recommended actions

  • Immediate: Upgrade Splunk Enterprise to 10.4.2, 10.2.6, 10.0.9, or 9.4.14, or later, matching your deployed major/minor version.
  • If patching is not immediately possible: Disable report embedding globally by setting allowEmbedTokenAuth = false in server.conf if embedded report functionality is not required, which prevents the affected REST API dispatch archive download path from being reachable via embedded report tokens.

References

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