CVE-2026-76404: In Splunk MCP Server app versions below 1.2.1, a user who holds the "admin" Splunk role could execute arbitrar

Q: How do I fix CVE-2026-76404?

model context protocol server: upgrade to 1.2.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-76404 being exploited?

CVE-2026-76404 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-76404 affect?

CVE-2026-76404 affects model context protocol server. Severity is critical (CVSS 9.1). In Splunk MCP Server app versions below 1.2.1, a user who holds the "admin" Splunk role could execute arbitrary commands on the underlying operating system. The vulnerability is possible because of missing input validation in the app's cred

Q: How urgent is CVE-2026-76404?

Priority 45/100. Critical severity

This month

CRITICAL 9.1UPGRADE

CVE-2026-76404 is a critical-severity flaw (CVSS 9.1) affecting model context protocol server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In Splunk MCP Server app versions below 1.2.1, a user who holds the "admin" Splunk role could execute arbitrary commands on the underlying operating system. The vulnerability is possible because of missing input validation in the app's credential management component, which deserializes stored data without checking whether the content is of the expected type.

Why this priority

Critical severity

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.7% (top 46%)
CISA exploited list	No
Weakness	CWE-502
Published	2026-08-19
Last modified	2026-10-24

Publisher (CNA): Cisco Systems, Inc. · Vendor: splunk

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-19 22:17 UTCPublished CVE record published
2026-10-24 13:10 UTCUpdated Record last modified

splunk model context protocol server UPGRADE

Affected: < 1.2.1

Fixed in: 1.2.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy model-context-protocol-server || rpm -q model-context-protocol-server || model-context-protocol-server --version

2. UPGRADE to 1.2.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade model-context-protocol-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade model-context-protocol-server

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

Fedora 46 · kwin-zones · FIXED · 1.0.13-1.fc46 · FEDORA-2026-95888f332b · source

sudo dnf upgrade --advisory=FEDORA-2026-95888f332b

Fedora ELN · nginx-mod-brotli · FIXED · 1.0.0~rc-16.eln159 · FEDORA-2026-501a6a8273 · source

sudo dnf upgrade --advisory=FEDORA-2026-501a6a8273

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-76404?

model context protocol server: upgrade to 1.2.1. Exact commands for each OS are on this page.

Is CVE-2026-76404 being exploited?

CVE-2026-76404 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-76404 affect?

CVE-2026-76404 affects model context protocol server. Severity is critical (CVSS 9.1). In Splunk MCP Server app versions below 1.2.1, a user who holds the "admin" Splunk role could execute arbitrary commands on the underlying operating system. The vulnerability is possible because of missing input validation in the app's cred

How urgent is CVE-2026-76404?

Priority 45/100. Critical severity

Software pages

Splunk vulnerabilities

References

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