6.1

CVE-2025-20378: splunk Open Redirect

CVSS: 6.1v3.1MediumAnalyzed
Published 12-11-2025Last modified 12-11-2025
Open JSON

Vulnerability summary

CVE-2025-20378 is a medium (CVSS 6.1) Open Redirect vulnerability in splunk. EPSS estimates a 0.25% chance of exploitation in the next 30 days, higher than 15.6% of scored vulnerabilities.

Overall risk
24/100
0100
Low · default modelHow is this calculated?
CVSS score
6.1/10
010
Medium · v3.1 (NVD)
EPSS score
0.25%
0%100%
Low · +0.02 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 12-11-2025
    PublishedVulnerability first disclosed.
  2. 12-11-2025
    Last modifiedVulnerability information updated.

Description

In Splunk Enterprise versions below 10.0.1, 9.4.5, 9.3.7, 9.2.9, and Splunk Cloud Platform versions below 10.0.2503.5, 9.3.2411.111, and 9.3.2408.121, an unauthenticated attacker could craft a malicious URL using the `return_to` parameter of the Splunk Web login endpoint. When an authenticated user visits the malicious URL, it could cause an unvalidated redirect to an external malicious site. To be successful, the attacker has to trick the victim into initiating a request from their browser. The unauthenticated attacker should not be able to exploit the vulnerability at will.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.25%

Chance of exploitation in the next 30 days

Percentile

16%

Versus all other CVEs

30-day change

+0.02 pp

From 0.24% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.25%

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≥ 9.2.0, < 9.2.9 | ≥ 9.3.0, < 9.3.7 | ≥ 9.4.0, < 9.4.5 | 10.0.0
  • splunk_cloud_platform≥ 9.3.2408, < 9.3.2408.121 | ≥ 9.3.2411, < 9.3.2411.111 | ≥ 10.0.2503, < 10.0.2503.5
  • splunk enterprise≥ 10.0, < 10.0.1 | ≥ 9.4, < 9.4.5 | ≥ 9.3, < 9.3.7 | ≥ 9.2, < 9.2.9

1 vendor · 3 products

References

1 links