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CVE-2026-76312 – Authorization Bypass / Session Hijack via Embedded Reports – Splunk Enterprise (9.4

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Summary

CVE-2026-76312 is a critical improper access control vulnerability (CWE-284) in Splunk Enterprise’s embedded reports functionality. An unauthenticated attacker who can read the HTML source of a page embedding a Splunk report can extract exposed session material and use it to access data and affect system integrity on the Splunk instance. The flaw carries a CVSS v3.1 base score of 9.4 (Critical).

Technical details

  • Root cause: improper enforcement of authorization boundaries for embedded reports in the search job dispatch archive download path.
  • Trigger condition: a page that embeds a Splunk report exposes session material in its HTML source; anyone able to view that HTML can extract it without authenticating to Splunk.
  • Attack vector: network-based, no privileges or user interaction required (AV:N/AC:L/PR:N/UI:N).
  • Impact: the extracted session material can be used to download dispatch archives and access data belonging to the report’s creator, with high impact to confidentiality and integrity and low impact to availability.

Affected software

  • Splunk Enterprise 10.4.0 – 10.4.1
  • Splunk Enterprise 10.2.0 – 10.2.5
  • Splunk Enterprise 10.0.0 – 10.0.8
  • Splunk Enterprise 9.4.0 – 9.4.13

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

Mitigation and recommended actions

  • Immediate: upgrade to Splunk Enterprise 10.4.2, 10.2.6, 10.0.9, or 9.4.14 (or later), as applicable to the deployed version line.
  • If patching is not immediately possible: disable embedded reports by setting allowEmbedTokenAuth = false in server.conf if the feature is not in use, or disable Splunk Web entirely as a temporary network-level mitigation.

References

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