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Vulnerabilities

Security incident · CVE-2025-20378

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 c

Published Nov 12, 2025 · catalog updated Oct 18, 2026 · Splunk Splunk Cloud Platform

Last checked Oct 25, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-20378. EPSS is 0.25%. Act only if a listed version of Splunk Splunk Cloud Platform is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium6.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.25%
Remediation
Version ranges on file
Affected products
cpe splunk/splunk · cpe splunk/splunk cloud platform · vendor Splunk Splunk Cloud Platform 10.0.2503 <10.0.2503.5

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 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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe splunk/splunk10.0.0
  • cpe splunk/splunk cloud platformversion unspecified
  • vendor Splunk Splunk Cloud Platform 10.0.2503 <10.0.2503.510.0.2503 <10.0.2503.5

How to fix CVE-2025-20378

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-20378. EPSS is 0.25%. Act only if a listed version of Splunk Splunk Cloud Platform is installed.

Which versions are affected?

Compare what you have installed with Splunk Splunk Cloud Platform 10.0.2503 <10.0.2503.5 10.0.2503 <10.0.2503.5. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-601: URL Redirection to Untrusted Site (Open Redirect). EPSS 0.25%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Nov 12, 2025 · NIST NVD

    Detected

    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 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

  2. Oct 18, 2026 · NIST NVD

    Updated

    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 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

Sources

  • CVE.orgVulnerability recordCVE-2025-20378

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-20378

    30-day exploitation probability 0.25%

    first.org
  • EUVDVulnerability recordEUVD-2025-131961

    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 parameter of the Splunk Web login endpoint. When an authenticat

    euvd.enisa.europa.eu
  • NIST NVDVulnerability recordCVE-2025-20378

    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 parameter of the Splunk Web login endpoint. When an

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 24, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • EUVDOct 25, 2026
  • FIRST EPSSOct 24, 2026
  • CVE.orgOct 21, 2026
  • NIST NVDOct 18, 2026