VulnerabilityDeferred

CVE-2026-26067

Prior to 3.7.14 and 4.1.10, a server-side information disclosure vulnerability was identified in the handling of CSS preprocessor files.

MEDIUM 4.9EPSS 0.25%

Does this matter?

Lower severity and a low EPSS score (0.25%). Track it; it rarely justifies an emergency change on its own.

Description

October is a Content Management System (CMS) and web platform. Prior to 3.7.14 and 4.1.10, a server-side information disclosure vulnerability was identified in the handling of CSS preprocessor files. Backend users with Editor permissions could craft .less, .sass, or .scss files that leverage the compiler's import functionality to read arbitrary files from the server. This worked even with cms.safe_mode enabled. This vulnerability is fixed in 3.7.14 and 4.1.10.

CVSS 3.1: 4.9 MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
EPSS: 0.25% probability · 16th percentile
CISA KEV: Not listed
Weakness: CWE-184, CWE-863
Source: security-advisories@github.com

References

https://github.com/octobercms/october/security/advisories/GHSA-3888-q23f-x7qh

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.