Input validation error in Splunk Secure Gateway - CVE-2026-76277
Published: October 12, 2026
Vulnerability identifier: #VU154112
CSH Severity: Low
CVSS v4: 2.1 [CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-76277
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote privileged user to cause distinct native Splunk accounts to share configuration data and disrupt user-management operations.
The vulnerability exists due to improper input validation in native Splunk username validation when using a username ending with a period for a user directory. A remote privileged user can create a native Splunk username with a trailing period through the REST API to cause distinct native Splunk accounts to share configuration data and disrupt user-management operations.
Exploitation requires the edit_user capability. User-management operations can affect the wrong account or fail.
Affected software
Splunk Secure Gateway
Splunk Enterprise
Splunk Enterprise
How to mitigate CVE-2026-76277
Install security update from vendor's website.
Splunk Secure Gateway - addressed in versions 3.8.72, 3.9.25, 3.10.11
Splunk Enterprise - addressed in versions 9.4.15, 10.0.10, 10.2.7, 10.4.3
Splunk Enterprise - addressed in versions 9.4.15, 10.0.10, 10.2.7, 10.4.3