# CVE-2026-76366: Information Disclosure through the REST API in Splunk SOAR

> Authenticated users can exploit REST API filtering to recover session tokens, leading to unauthorized access to all data available to the affected user.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 19 Aug 2026
- **Updated:** 20 Aug 2026
- **Also known as:** GHSA-24cw-c957-pr32

## What is CVE-2026-76366?

CVE-2026-76366 is a medium-severity vulnerability in Splunk SOAR, published on 19 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

In Splunk SOAR versions below 8.6.0, a user with a valid Splunk SOAR account could use Representational State Transfer (REST) API filtering on playbook runs to recover session tokens that compromise all data available to the affected user. The information disclosure is possible because Splunk SOAR does not block REST API filters from matching values that responses otherwise hide. For more information see REST Run Playbook (https://help.splunk.com/en/splunk-soar/soar-cloud/rest-api-reference/run-playbook-endpoints/rest-run-playbook) in the Splunk documentation.

Weakness: CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## Which versions are affected by CVE-2026-76366?

It affects 1 product.


Products: Splunk Soar.

## How do I fix CVE-2026-76366?

No fix has been published for CVE-2026-76366 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-76366 being exploited?

There is no known exploitation of CVE-2026-76366 in the wild and no public exploit code.

## Other vulnerabilities in Splunk SOAR

- [CVE-2023-3997](https://insights.sbomify.com/CVE-2023-3997/): Unauthenticated Log Injection In Splunk SOAR (high 8.6)
- [CVE-2026-76356](https://insights.sbomify.com/CVE-2026-76356/): Authentication Bypass through IP Address Spoofing in the Automation Broker in Splunk SOAR (high 8.1)
- [CVE-2026-76357](https://insights.sbomify.com/CVE-2026-76357/): Remote Code Execution (RCE) through Path Traversal in the REST API in Splunk SOAR (high 7.6)
- [CVE-2026-76362](https://insights.sbomify.com/CVE-2026-76362/): Improper Certificate Validation through CyberArk Vault Privileged Access Manager in Splunk SOAR (high 7.4)
- [CVE-2026-76358](https://insights.sbomify.com/CVE-2026-76358/): Path Traversal through App Installation Tar Extraction in Splunk SOAR (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-76366 and fix it if it is affected.

What it is: CVE-2026-76366 is a medium-severity vulnerability in Splunk SOAR, published on 19 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-76366 in the wild and no public exploit code.

Affected product: Splunk SOAR. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-76366/ (Markdown: https://insights.sbomify.com/CVE-2026-76366/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-76366
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-76366
- OSV: https://osv.dev/vulnerability/CVE-2026-76366

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-76366/
Summaries are generated and may contain mistakes; the official description above is the record.