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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
2026-05-28
Advisory published
2026-05-27
Advisory updated
2026-05-28

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.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-6938 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-6938

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-6938 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-6938

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.