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High-Risk CVE-2026-76266 Discovered in Splunk Enterprise

High-Risk CVE-2026-76266 Discovered in Splunk Enterprise

First seen 8 Oct 2026, 02:29 UTC • •
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ThreatCluster AI
ThreatCluster •October 8, 2026 at 03:31 UTC
  • •CVE-2026-76266 allows local users to escalate privileges on vulnerable Splunk Enterprise versions.
  • •The vulnerability affects Linux installations below specific versions, with potential for severe impacts.
  • •Immediate upgrade to patched versions is recommended to mitigate risks.

A local escalation vulnerability, CVE-2026-76266, has been identified in Splunk Enterprise versions below 10.4.3, 10.2.7, 10.0.10, and 9.4.15 on Linux systems. This flaw allows a local user with command execution privileges to exploit a package upgrade process, potentially executing arbitrary commands with root access. The vulnerability arises from the trust placed in existing installation content during upgrades. Successful exploitation could lead to significant impacts, including data theft and service disruption. The urgency of the situation is unclear due to the lack of KEV, SSVC, PoC, and EPSS indicators. Affected users are primarily those running Linux deployments with less controlled service-account access. The recommended mitigation is to upgrade to a fixed version or use an archive-based upgrade method until patched.

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Timeline

2026-10-07
CVE-2026-76266 published
Splunk disclosed a high-risk local escalation vulnerability affecting multiple versions of Splunk Enterprise.
Redpacketsecurity
2026-10-08
Splunk releases advisory
Splunk addressed multiple vulnerabilities, including CVE-2026-76266, urging users to upgrade to fixed versions.
advisory.splunk.com

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Common questions

Which versions of Splunk are affected?
Splunk Enterprise versions below 10.4.3, 10.2.7, 10.0.10, and 9.4.15 on Linux are affected.
What should I do if I'm affected?
Upgrade to the fixed versions as soon as change controls allow, or use the archive-based upgrade method until patched.
Is this vulnerability actively being exploited?
No confirmed exploitation has been reported; the vulnerability is disclosed but not yet actively exploited.