CVE-2026-20257
Last modified
CVE-2026-20257 is a medium-severity vulnerability rated 5.7/10 on the CVSS scale. 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. EPSS estimates a 0.20% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Splunk | Splunk | >= 9.3.0, < 9.3.13 |
| Splunk | Splunk | >= 9.4.0, < 9.4.12 |
| Splunk | Splunk | >= 10.0.0, < 10.0.7 |
| Splunk | Splunk | >= 10.2.0, < 10.2.4 |
| Splunk | Splunk Cloud Platform | >= 9.3.2411, < 9.3.2411.132 |
| Splunk | Splunk Cloud Platform | >= 10.1.2507, < 10.1.2507.23 |
| Splunk | Splunk Cloud Platform | >= 10.2.2510, < 10.2.2510.15 |
| Splunk | Splunk Cloud Platform | >= 10.3.2512, < 10.3.2512.13 |
References
- https://advisory.splunk.com/advisories/SVD-2026-0607Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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