CVE-2026-76267Network attack vectorHinoki check available

App-log forgery via unneutralized SignalFlow content

Published Oct 7, 2026 · Updated Oct 7, 2026

Log injection in affected Splunk Enterprise 10.x releases allows remote authenticated users to forge app-log entries through REST requests. Splunk App for Splunk O11y Cloud writes user-supplied SignalFlow content to its app log without neutralizing it, allowing crafted content to appear as separate log entries. Exploitation requires a role with the read_o11y_content capability and the affected app; the affected branches are 10.0 through 10.0.9, 10.2 through 10.2.6, and 10.4 through 10.4.2, while 9.4.x is unaffected.

CVSS severity4.3
Medium
EPSS probability0.17%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
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Summary

What happened

Log injection in affected Splunk Enterprise 10.x releases allows remote authenticated users to forge app-log entries through REST requests. Splunk App for Splunk O11y Cloud writes user-supplied SignalFlow content to its app log without neutralizing it, allowing crafted content to appear as separate log entries. Exploitation requires a role with the read_o11y_content capability and the affected app; the affected branches are 10.0 through 10.0.9, 10.2 through 10.2.6, and 10.4 through 10.4.2, while 9.4.x is unaffected.

The record

CVE
CVE-2026-76267
Published
Oct 7, 2026
Updated
Oct 7, 2026
Vendor
Splunk, Inc.
Product
Splunk Enterprise
Classifications
CWE-117, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 7, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.0 <10.0.10
  2. Affected versionversion=10.2 <10.2.7
  3. Affected versionversion=10.4 <10.4.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Splunk, Inc. · Splunk Enterpriseversion=10.0 <10.0.10; version=10.2 <10.2.7; version=10.4 <10.4.3

Published CVSS scores

4.3SplunkCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-117Improper Output Neutralization for Logs
T1565.001Stored Data Manipulation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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