CVE-2026-26067Network attack vector

Authenticated file read via preprocessor imports

Published Apr 21, 2026 · Updated Apr 21, 2026

Information disclosure in October CMS before 3.7.14 and 4.0.0 through 4.1.9 allows remote authenticated users to read server files. The CMS editor, media manager, and upload interfaces accept .less, .sass, and .scss assets whose compiler import directives resolve attacker-supplied server paths. Editor permission and cms.safe_mode are required for this bypass, which exposes readable server-side files without granting write access or service interruption.

CVSS severity4.9
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in October CMS before 3.7.14 and 4.0.0 through 4.1.9 allows remote authenticated users to read server files. The CMS editor, media manager, and upload interfaces accept .less, .sass, and .scss assets whose compiler import directives resolve attacker-supplied server paths. Editor permission and cms.safe_mode are required for this bypass, which exposes readable server-side files without granting write access or service interruption.

The record

CVE
CVE-2026-26067
Published
Apr 21, 2026
Updated
Apr 21, 2026
Vendor
October CMS
Product
October CMS
Classifications
CWE-184, CWE-863, T1005
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 21, 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=< 3.7.14
  2. Affected versionversion=>= 4.0.0, < 4.1.10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

October CMS · October CMSversion=< 3.7.14; version=>= 4.0.0, < 4.1.10

Published CVSS scores

4.9GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/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.

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

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-184Incomplete List of Disallowed Inputs
CWE-863Incorrect Authorization
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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