What’s Vulnerable › Vulnerabilities

CVE-2023-40595: Remote Code Execution via Serialized Session Payload

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-08-30 · updated 2026-06-17
• Weakness: CWE-502

Description

In Splunk Enterprise versions lower than 8.2.12, 9.0.6, and 9.1.1, an attacker can execute a specially crafted query that they can then use to serialize untrusted data. The attacker can use the query to execute arbitrary code.

Affected products

• Splunk Enterprise: from 8.2.0 before 8.2.12; from 9.0.0 before 9.0.6; 9.1.0 — fixed in 8.2.12, 9.0.6
• Splunk Cloud Platform: through 9.0.2305.100

How to fix

Upgrade to a fixed version: Splunk Enterprise 8.2.12, 9.0.6. Check the vendor advisory for mitigations.

References

• https://advisory.splunk.com/advisories/SVD-2023-0804
• https://research.splunk.com/application/d1d8fda6-874a-400f-82cf-dcbb59d8e4db/
• https://advisory.splunk.com/advisories/SVD-2023-0804
• https://research.splunk.com/application/d1d8fda6-874a-400f-82cf-dcbb59d8e4db/

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