What’s Vulnerable › Vulnerabilities

CVE-2023-40593: Denial of Service (DoS) in Splunk Enterprise Using a Malformed SAML Request

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% 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-400

Description

In Splunk Enterprise versions lower than 9.0.6 and 8.2.12, a malicious actor can send a malformed security assertion markup language (SAML) request to the `/saml/acs` REST endpoint which can cause a denial of service through a crash or hang of the Splunk daemon.

Affected products

• Splunk Enterprise: from 8.2.0 before 8.2.12; from 9.0.0 before 9.0.6 — 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-2023-0802
• https://research.splunk.com/application/8e8a86d5-f323-4567-95be-8e817e2baee6/
• https://advisory.splunk.com/advisories/SVD-2023-0802
• https://research.splunk.com/application/8e8a86d5-f323-4567-95be-8e817e2baee6/

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