SB2026111258 - Improper Authorization in S3 File System CORS Upload module for Drupal
Published: November 12, 2026
Security Bulletin ID
SB2026111258
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper Authorization (CVE-ID: CVE-2026-126746)
CWE-ID: CWE-285 - Improper Authorization
CVSSv4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to bypass authorization checks.
The vulnerability exists due to the affected module does not sufficiently restrict the upload permission it gives the browser. A remote user can overwrite other files already stored in the bucket.
Remediation
Install update from vendor's website.