What is CVE-2026-20258?

CVE-2026-20258 is a high-severity vulnerability in Splunk, classified under Cross-site Scripting. CVSS score: 7.1/10. Published 2026-06-10.

How severe is CVE-2026-20258?

High severity. CVSS v3 base score is 7.1 out of 10.

XSS in Splunk

CVE-2026-20258

In Splunk Enterprise versions below 10.2.4, 10.0.7, 9.4.12, and 9.3.13, and Splunk Cloud Platform versions below 10.3.2512.11, 10.2.2510.15, 10.1.2507.23, and 9.3.2411.132, a low-privileged user that does not hold the "admin" or "power" Sp…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (14.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H.

Affected products

Splunk
Splunk Cloud Platform — versions 10.3.2512, 10.2.2510, 10.1.2507
Splunk Splunk_cloud_platform
Splunk Enterprise — versions 10.2, 10.0, 9.4

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

psirt@cisco.com (Vendor Advisory)

Frequently asked questions

What is CVE-2026-20258?: CVE-2026-20258 is a high-severity vulnerability in Splunk, classified under Cross-site Scripting. CVSS score: 7.1/10. Published 2026-06-10.
How severe is CVE-2026-20258?: High severity. CVSS v3 base score is 7.1 out of 10.