CVE-2026-76351: In Splunk Enterprise versions below 10.4.2, 10.2.6, 10.0.9, and 9.4.14, and Splunk Secure Gateway versions bel

This month

HIGH 8.8UPGRADEUPGRADE

CVE-2026-76351 is a high-severity flaw (CVSS 8.8) affecting splunk, splunk secure gateway. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In Splunk Enterprise versions below 10.4.2, 10.2.6, 10.0.9, and 9.4.14, and Splunk Secure Gateway versions below 3.10.9, 3.9.23, and 3.8.70, a user who does not hold the "admin" or "power" Splunk roles could use crafted report notification data to cause Splunk Secure Gateway to send a request to the Splunk Enterprise Representational State Transfer (REST) API using a system-level session token and modify the Splunk platform configuration. The use

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 64%)
CISA exploited list	No
Weakness	CWE-918
Published	2026-08-19
Last modified	2026-08-21

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

Last updated 2026-08-21 · 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
2026-08-21 19:17 UTCUpdated Record last modified

splunk splunk UPGRADE

Affected: >= 9.4.0 and < 9.4.14 · >= 10.0.0 and < 10.0.9 · >= 10.2.0 and < 10.2.6 · >= 10.4.0 and < 10.4.2

Fixed in: 9.4.14, 10.0.9, 10.2.6, 10.4.2

Safe to downgrade to: a release before 9.4.0

1. Check installed version

apt-cache policy splunk || rpm -q splunk || splunk --version

2. UPGRADE to 9.4.14 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade splunk

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade splunk

Note

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

3. If no update is available yet, DOWNGRADE to a release before 9.4.0 (Debian / Ubuntu)

apt-cache madison splunk sudo apt install splunk=<VERSION_BEFORE_9.4.0> sudo apt-mark hold splunk

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list splunk sudo dnf downgrade splunk-<VERSION_BEFORE_9.4.0> sudo dnf versionlock add splunk

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

splunk splunk secure gateway UPGRADE

Affected: >= 3.8.0 and < 3.8.70 · >= 3.9.0 and < 3.9.23 · >= 3.10.0 and < 3.10.9

Fixed in: 3.8.70, 3.9.23, 3.10.9

Safe to downgrade to: a release before 3.8.0

1. Check installed version

apt-cache policy splunk-secure-gateway || rpm -q splunk-secure-gateway || splunk-secure-gateway --version

2. UPGRADE to 3.8.70 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade splunk-secure-gateway

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade splunk-secure-gateway

Note

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

3. If no update is available yet, DOWNGRADE to a release before 3.8.0 (Debian / Ubuntu)

apt-cache madison splunk-secure-gateway sudo apt install splunk-secure-gateway=<VERSION_BEFORE_3.8.0> sudo apt-mark hold splunk-secure-gateway

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list splunk-secure-gateway sudo dnf downgrade splunk-secure-gateway-<VERSION_BEFORE_3.8.0> sudo dnf versionlock add splunk-secure-gateway

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2026-76351?

splunk: upgrade to 9.4.14, 10.0.9, 10.2.6, 10.4.2; splunk secure gateway: upgrade to 3.8.70, 3.9.23, 3.10.9. Exact commands for each OS are on this page.

Is CVE-2026-76351 being exploited?

CVE-2026-76351 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-2026-76351 affect?

CVE-2026-76351 affects splunk, splunk secure gateway. Severity is high (CVSS 8.8). In Splunk Enterprise versions below 10.4.2, 10.2.6, 10.0.9, and 9.4.14, and Splunk Secure Gateway versions below 3.10.9, 3.9.23, and 3.8.70, a user who does not hold the "admin" or "power" Splunk roles could use crafted report notification

How urgent is CVE-2026-76351?

Priority 40/100. High severity

Software pages

Splunk vulnerabilities

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References

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