5.7

CVE-2026-20257: splunk Improper Input Validation

CVSS: 5.7v3.1MediumAnalyzed
Published 10-06-2026Last modified 10-06-2026
Open JSON

Vulnerability summary

CVE-2026-20257 is a medium (CVSS 5.7) Improper Input Validation vulnerability in splunk. EPSS estimates a 0.29% chance of exploitation in the next 30 days, higher than 20.5% of scored vulnerabilities.

Overall risk
23/100
0100
Low · default modelHow is this calculated?
CVSS score
5.7/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.29%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 10-06-2026
    PublishedVulnerability first disclosed.
  2. 10-06-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.29%

Chance of exploitation in the next 30 days

Percentile

21%

Versus all other CVEs

30-day change

0.00 pp

From 0.29% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.29%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Splunk3 products
  • splunk≥ 9.3.0, < 9.3.13 | ≥ 9.4.0, < 9.4.12 | ≥ 10.0.0, < 10.0.7 | ≥ 10.2.0, < 10.2.4
  • splunk_cloud_platform≥ 9.3.2411, < 9.3.2411.132 | ≥ 10.1.2507, < 10.1.2507.23 | ≥ 10.2.2510, < 10.2.2510.15 | ≥ 10.3.2512, < 10.3.2512.13
  • splunk enterprise≥ 10.2, < 10.2.4 | ≥ 10.0, < 10.0.7 | ≥ 9.4, < 9.4.12 | ≥ 9.3, < 9.3.13

1 vendor · 3 products

References

1 links