CVE-2023-40593 Denial of Service (DoS) in Splunk Enterprise Using a Malformed SAML Request
Attackers can crash or hang the Splunk daemon by sending malformed SAML requests, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-40593?
CVE-2023-40593 is a medium-severity denial of service vulnerability in Splunk Splunk, published on 30 Aug 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-400
Which versions are affected by CVE-2023-40593?
It affects 2 products.
Products include Splunk Splunk, Splunk Splunk Cloud Platform.
How do I fix CVE-2023-40593?
No fix has been published for CVE-2023-40593 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2023-40593 being exploited?
There is no known exploitation of CVE-2023-40593 in the wild and no public exploit code.
Other vulnerabilities in Splunk Splunk
- CVE-2026-20253 Splunk Enterprise Missing Authentication for Critical Function
- CVE-2026-76268 Missing Authentication for Critical Function in the Patroni REST API in Splunk Enterprise
- CVE-2026-76284 Improper Neutralization in Splunk Enterprise
- CVE-2026-76285 Improper Adherence to Coding Standards in Splunk Enterprise
- CVE-2017-17067 Auth bypass in n/a
Sources
Also known as GHSA-qpqv-mwrg-mw8j.