CVE-2026-20257

Improper Input Validation through Classic Dashboard CSS in Splunk Enterprise

MEDIUM

5.7

CVSS Score

Published: June 10, 2026 at 05:16 PM UTC

Updated: June 17, 2026 at 10:17 AM UTC

2 products affected across 1 vendorSplunkSplunk Cloud Platform

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Severity

MEDIUM5.7

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

Description

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Splunk · Splunk

95%

10.0 ≤ v < 10.0.710.0.0 ≤ v < 10.0.710.2 ≤ v < 10.2.410.2.0 ≤ v < 10.2.49.3 ≤ v < 9.3.139.3.0 ≤ v < 9.3.139.4 ≤ v < 9.4.129.4.0 ≤ v < 9.4.1210.0 10.2 9.3 9.4

Affected range stops below 10.0.7, so it looks safe — our inference, not a vendor statement

Affected range stops below 10.2.4, so it looks safe — our inference, not a vendor statement

Affected range stops below 9.3.13, so it looks safe — our inference, not a vendor statement

Affected range stops below 9.4.12, so it looks safe — our inference, not a vendor statement

Splunk Cloud Platform · Splunk

95%

10.1.2507 ≤ v < 10.1.2507.2310.2.2510 ≤ v < 10.2.2510.1510.3.2512 ≤ v < 10.3.2512.139.3.2411 ≤ v < 9.3.2411.13210.1.2507 10.2.2510 10.3.2512 9.3.2411

Affected range stops below 10.1.2507.23, so it looks safe — our inference, not a vendor statement

Affected range stops below 10.2.2510.15, so it looks safe — our inference, not a vendor statement

Affected range stops below 10.3.2512.13, so it looks safe — our inference, not a vendor statement

Affected range stops below 9.3.2411.132, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://advisory.splunk.com/advisories/SVD-2026-0607

References (1)

Vendor Advisory

Source: cverecord

https://advisory.splunk.com/advisories/SVD-2026-0607

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.7MEDIUMcisco

Vector?

Quick Info

StatusANALYZED

CWE

CWE-20

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