# CVE-2026-16905: IBM Db2 Mirror for i improper authentication leading to information disclosure

Source: https://junglewise.ai/threats/cve-2026-16905-ibm-db2-mirror-for-i-improper-authentication-leading-to  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-14. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-16905 · Severity: medium · CVSS 5.3 · Published 2026-08-14

IBM Db2 Mirror for i is a database mirroring and high-availability solution for the IBM i platform. A flaw in its authentication mechanism allows a remote authenticated user to access sensitive information they should not be permitted to view. This could enable attackers to steal confidential business data or system configuration details without proper authorization.

Technologies: [IBM Db2 Mirror For I](https://junglewise.ai/threats/technologies/db2-mirror-for-i). Vendors: [IBM](https://junglewise.ai/threats/vendors/ibm).

## Quick answers

**Is CVE-2026-16905 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-16905 being exploited in the wild.

**How severe is CVE-2026-16905?** Medium severity, with a CVSS score of 5.3, published 14 August 2026.

**Which products and versions are affected?** IBM Db2 Mirror For I 7.4, 7.5, and 7.6.

**Is there a fix for CVE-2026-16905?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-16905 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-16905?** Check whether you run IBM Db2 Mirror For I at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

CVE-2026-16905 is an improper authentication vulnerability (CWE-287) in IBM Db2 Mirror for i that allows remote authenticated attackers to obtain sensitive information. The vulnerability stems from inadequate authentication validation, which fails to properly restrict access to protected resources. No user interaction is required; an authenticated attacker can exploit this over the network to read data they are not authorized to access. Patching is available through IBM; affected versions are 7.4, 7.5, and 7.6.

## Affected products

- IBM Db2 Mirror for i 7.4, 7.5, and 7.6

## Timeline

- 2026-08-14: disclosed
- other: Part of a multi-vulnerability security bulletin affecting Db2 Mirror for i GUI

## References

- [https://www.ibm.com/support/pages/node/7283359](https://www.ibm.com/support/pages/node/7283359)

## Related threats

- [IBM Db2 Mirror for i privilege escalation in GUI](https://junglewise.ai/threats/cve-2026-96012-ibm-db2-mirror-for-i-7-4-7-5-and-7-6-is-vulnerable-to-privilege)
- [IBM Db2 Mirror for i CSRF in GUI](https://junglewise.ai/threats/cve-2026-17047-ibm-db2-mirror-for-i-csrf-in-gui)
- [IBM Db2 Mirror for i improper authorization in SQL procedure](https://junglewise.ai/threats/cve-2026-17483-ibm-db2-mirror-for-i-improper-authorization-in-sql-procedure)
- [IBM Db2 Mirror for i out-of-bounds read denial of service](https://junglewise.ai/threats/cve-2026-16660-ibm-db2-mirror-for-i-out-of-bounds-read-denial-of-service)
- [IBM Db2 Mirror for i race condition in Unix domain socket path](https://junglewise.ai/threats/cve-2026-18567-ibm-db2-mirror-for-i-race-condition-in-unix-domain-socket-path)