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CVE-2026-20257

Improper Input Validation through Classic Dashboard CSS in Splunk Enterprise PUBLISHED

Description (CNA)

In Splunk Enterprise versions below 10.2.4, 10.0.7, 9.4.12, and 9.3.13, and Splunk Cloud Platform versions below 10.3.2512.13, 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" Splunk roles could craft a classic dashboard that exfiltrates sensitive data from the browser of a higher-privileged user who views it. The exfiltration is possible because classic dashboard panels do not fully validate style attribute values, which can allow for requests to reach external domains outside the configured Trusted Domains List. The vulnerability requires the attacker to phish the victim by tricking them into initiating a request within their browser. The low-privileged user should not be able to exploit the vulnerability at will.

Affected (CNA)

Vendor / productVersions
Splunk / Splunk Enterpriseaffected 10.2 before 10.2.4; affected 10.0 before 10.0.7; affected 9.4 before 9.4.12; affected 9.3 before 9.3.13
Splunk / Splunk Cloud Platformaffected 10.3.2512 before 10.3.2512.13; affected 10.2.2510 before 10.2.2510.15; affected 10.1.2507 before 10.1.2507.23; affected 9.3.2411 before 9.3.2411.132

CWE

CWE-20

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.