S3 File System - Moderately critical - Access bypass - SA-CONTRIB-2026-279

published 2026-10-28 11 d ago modified 2026-11-06 3 d ago also DRUPAL-CONTRIB-2026-279 , EUVD-2026-113692

cvss: 5.6; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.1%; EPSS 0.1% chance of exploitation in 30 days, percentile 4%
public exploits: 0; none known

Incorrect Permission Assignment for Critical Resource vulnerability in Drupal S3 File System allows Exploiting Incorrectly Configured Access Control Security Levels. This issue affects S3 File System versions: from 0.0.0 to 3.12.0.

Patch / fix

fixed in 2

packagist drupal/s3fs 3.12.0
Drupal S3 File System 3.12.0

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 3 d ago (2026-11-06)

Exploit prediction

0.15% chance of exploitation in the next 30 days, higher than 4% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	5.6	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
CNA	3.1	5.6	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

Affected packages

ecosystem	package	affected	fixed in
packagist	drupal/s3fs	<3.12.0	3.12.0

Affected products

Drupal S3 File System

Classification

Weakness

CWE-732 Incorrect Permission Assignment for Critical Resource

References

drupal.org /sa-contrib-2026-279
web

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.

Summary