CVE-2023-40595 Remote Code Execution via Serialized Session Payload
Attackers can execute arbitrary code by sending specially crafted serialized session payloads to Splunk Enterprise.
- 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-2023-40595?
CVE-2023-40595 is a high-severity unsafe deserialization 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 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.
Weakness: CWE-502
Which versions are affected by CVE-2023-40595?
It affects 2 products.
Products include Splunk Splunk, Splunk Splunk Cloud Platform.
How do I fix CVE-2023-40595?
No fix has been published for CVE-2023-40595 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2023-40595 being exploited?
There is no known exploitation of CVE-2023-40595 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-g4h3-62x9-fwxw.