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CVE-2026-20257

Improper Input Validation through Classic Dashboard CSS in Splunk Enterprise

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 10.2.4, 10.0.7, 9.4.12, 9.3.13, 10.3.2512.13, and 3 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: partial

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: partial

  3. Record last updated

Affected versions

  • Splunk Splunk Enterprise

    From 10.2 · fixed in 10.2.4; From 10.0 · fixed in 10.0.7; From 9.4 · fixed in 9.4.12; From 9.3 · fixed in 9.3.13

  • Splunk Splunk Cloud Platform

    From 10.3.2512 · fixed in 10.3.2512.13; From 10.2.2510 · fixed in 10.2.2510.15; From 10.1.2507 · fixed in 10.1.2507.23; From 9.3.2411 · fixed in 9.3.2411.132

References 1

advisory.splunk.com