# CVE-2026-76390: Information Disclosure through Splunk Web in Cisco Talos Intelligence for Enterprise Security Cloud

> Unauthenticated attackers can access OpenAPI specifications via Splunk Web, exposing REST API details for reconnaissance.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 19 Aug 2026
- **Updated:** 20 Aug 2026
- **Also known as:** GHSA-x4c2-cp22-3gjj

## What is CVE-2026-76390?

CVE-2026-76390 is a medium-severity vulnerability in Splunk Cisco Talos Intelligence for Enterprise Security Cloud, published on 19 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

In Cisco Talos Intelligence for Enterprise Security Cloud versions below 1.0.3, an unauthenticated user could access the add-on OpenAPI specification through Splunk Web static file paths. The exposed specification could allow for reconnaissance of the add-on Representational State Transfer (REST) API endpoints and authentication model. The vulnerability is possible because the generated OpenAPI specification is packaged in a static file path that Splunk Web serves without authentication. For more information see Deploy Cisco Talos Intelligence for Splunk Enterprise Security (https://help.splunk.com/en/splunk-enterprise-security-8/user-guide/8.0/introduction/deploy-cisco-talos-intelligence-for-splunk-enterprise-security-cloud-only) in the Splunk documentation.

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

## Which versions are affected by CVE-2026-76390?

It affects 1 product.


Products: Cisco Talos Intelligence for Enterprise Security Cloud.

## How do I fix CVE-2026-76390?

No fix has been published for CVE-2026-76390 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-76390 being exploited?

There is no known exploitation of CVE-2026-76390 in the wild and no public exploit code.

## Other vulnerabilities in Splunk Cisco Talos Intelligence for Enterprise Security Cloud

- [CVE-2026-76389](https://insights.sbomify.com/CVE-2026-76389/): Server-Side Request Forgery (SSRF) through the REST API in Cisco Talos Intelligence for Enterprise Security Cloud (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-76390 and fix it if it is affected.

What it is: CVE-2026-76390 is a medium-severity vulnerability in Splunk Cisco Talos Intelligence for Enterprise Security Cloud, published on 19 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-76390 in the wild and no public exploit code.

Affected product: Splunk Cisco Talos Intelligence for Enterprise Security Cloud. 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-2026-76390/ (Markdown: https://insights.sbomify.com/CVE-2026-76390/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-76390
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-76390
- OSV: https://osv.dev/vulnerability/CVE-2026-76390

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-76390/
Summaries are generated and may contain mistakes; the official description above is the record.