PatchSiren cyber security CVE debrief

CVE-2026-6938 IBM CVE debrief

IBM Db2 12.1.0 through 12.1.4 contains an authorization bypass vulnerability affecting remote object storage uploads. An authenticated attacker with low privileges can exploit improper authorization checks (CWE-285) via a specially crafted query parameter to bypass intended access controls when uploading to remote object storage paths. The vulnerability has network attack vector, low attack complexity, and requires low privileges but no user interaction. Confidentiality is not impacted, but integrity is rated HIGH with no availability impact. IBM has published security guidance. Organizations should apply vendor patches when available and review access controls for remote object storage configurations in affected Db2 deployments.

Vendor: IBM
Product: Db2
CVSS: MEDIUM 6.5
CISA KEV: Not listed in stored evidence
Original CVE published: 2026-05-27
Original CVE updated: 2026-05-27
Advisory published: 2026-05-27
Advisory updated: 2026-05-27

Who should care

Database administrators managing IBM Db2 12.1.x deployments with remote object storage integrations; security teams responsible for cloud-connected database infrastructure; compliance officers tracking authorization control effectiveness in regulated environments

Technical summary

The vulnerability exists in Db2's remote object storage upload functionality where improper authorization validation (CWE-285) allows authenticated users to craft special queries that bypass access controls. The flaw is confined to versions 12.1.0 through 12.1.4 and specifically affects upload operations to remote object storage paths. Network-accessible with low complexity exploitation requirements.

Defensive priority

medium

Recommended defensive actions

Review IBM security bulletin for patch availability and version-specific guidance
Audit remote object storage configurations in affected Db2 12.1.x deployments
Implement principle of least privilege for database accounts with remote storage access
Monitor upload operations to remote object storage paths for anomalous query parameters
Validate authorization controls on all remote storage integration points pending patch application

Evidence notes

Vulnerability confirmed through IBM PSIRT disclosure with CVSS 3.1 vector AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N. CWE-285 (Improper Authorization) identified as root cause. Affected versions explicitly bounded to 12.1.0-12.1.4.

Official resources

2026-05-27