# CVE-2026-76277: Improper Input Validation of Native Splunk Usernames through the REST API in Splunk Enterprise

> CVE-2026-76277: Improper Input Validation of Native Splunk Usernames through the REST API in Splunk Enterprise. CVSS 4.1 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-76277
Last updated: 2026-10-14T12:03:45Z

- Published: 2026-10-07 20:46 UTC · Updated: 2026-10-14 12:03 UTC · Assigner: cisco
- CVSS: 4.1 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:L
- EPSS: 0.24%, 16th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-20

## Description

In Splunk Enterprise versions below 10.4.3, 10.2.7, 10.0.10, and 9.4.15, a user that holds a role with the edit\_user capability could create a native Splunk username that ends with a period. The vulnerability is possible because username validation does not reject a trailing period before the username is used for a user directory. This can cause distinct native Splunk usernames to share per-user configuration data, and user-management operations can affect the wrong account or fail. For more information see Set up native Splunk authentication (https://help.splunk.com/en/splunk-enterprise/administer/manage-users-and-security/10.4/use-the-native-splunk-platform-authentication-scheme/set-up-native-splunk-authentication) and Define roles on the Splunk platform with capabilities (https://help.splunk.com/en/splunk-enterprise/administer/manage-users-and-security/10.4/manage-splunk-platform-users-and-roles/define-roles-on-the-splunk-platform-with-capabilities) in the Splunk documentation.

## Affected vendors and products

- Splunk: Splunk Enterprise

## Tracked companies

- [Splunk](https://rewindex.com/company/splunk.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-76277)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-76277)
- [https://advisory.splunk.com/advisories/SVD-2026-1001](https://advisory.splunk.com/advisories/SVD-2026-1001)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-76277 · Markdown: https://rewindex.com/cve/CVE-2026-76277.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-76277 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T04:04:13.229Z