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Fencer Vulns
medium 4.9

CVE-2026-26067 json

October: Safe Mode Bypass via CSS Preprocessor Compilers

published 2026-04-21 6 mo ago modified 2026-10-26 13 d ago also EUVD-2026-24153 , GHSA-3888-q23f-x7qh

cvss
4.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 15%
public exploits
0
none known

Summary

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.

Patch / fix

  • packagist october/system 3.7.14, 4.1.10
  • octobercms october 3.7.14, 4.1.10

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
6 mo ago

Exploit prediction

0.25% chance of exploitation in the next 30 days, higher than 15% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 4.9 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
GitHub 3.1 4.9 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
packagist october/system
<3.7.14
>=4.0.0, <4.1.10
3.7.14
4.1.10

Affected products

  • octobercms october

Classification

Weakness
  • CWE-863 Incorrect Authorization
  • CWE-184 Incomplete List of Disallowed Inputs
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
  • CWE-22 Improper Limitation of a Pathname to a Restricted Directory

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.