# CVE-2026-3157: IBM Sterling B2B Integrator information disclosure in mailbox component

Source: https://junglewise.ai/threats/cve-2026-3157-ibm-sterling-b2b-integrator-information-disclosure-in-mailbox  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-28. Updated: 2026-07-28  
License: CC BY 4.0 with a link back

CVE-2026-3157 · Severity: medium · CVSS 4.3 · Published 2026-07-28

IBM Sterling B2B Integrator and Sterling File Gateway, which are used by organizations to securely manage large-scale file transfers and business process integration, are affected by an information disclosure vulnerability. Sensitive information was inadvertently included in the source code comments of the mailbox user interface component. An authenticated user could view this information, potentially gaining insights into the system's configuration or internal workings that could be used to facilitate further unauthorized activities.

Technologies: [IBM Sterling File Gateway](https://junglewise.ai/threats/technologies/sterling-file-gateway), [IBM Sterling B2b Integrator](https://junglewise.ai/threats/technologies/sterling-b2b-integrator). Vendors: [IBM](https://junglewise.ai/threats/vendors/ibm).

## Quick answers

**Is CVE-2026-3157 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-3157 being exploited in the wild.

**How severe is CVE-2026-3157?** Medium severity, with a CVSS score of 4.3, published 28 July 2026.

**Which products and versions are affected?** IBM Sterling File Gateway 6.2.0.0 - 6.2.0.5_2, 6.2.1.0 - 6.2.1.1_2, 6.2.2.0 - 6.2.2.0_1; IBM Sterling B2b Integrator 6.2.0.0 - 6.2.0.5_2, 6.2.1.0 - 6.2.1.1_2, 6.2.2.0 - 6.2.2.0_1.

**Is there a fix for CVE-2026-3157?** 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-2026-3157 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-3157?** Check whether you run IBM Sterling File Gateway or IBM Sterling B2b Integrator 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

This vulnerability (CWE-615) exists in the mailbox component user interface of IBM Sterling B2B Integrator and Sterling File Gateway. The root cause is the inclusion of sensitive information within source code comments that are accessible to users. An authenticated attacker with network access to the mailbox UI can view these comments by inspecting the page source or client-side code. This could lead to the disclosure of internal system details or configuration data. The issue is resolved in versions 6.2.0.6, 6.2.1.2, and 6.2.2.1.

## Affected products

- IBM Sterling B2B Integrator 6.2.0.0 - 6.2.0.5_2, 6.2.1.0 - 6.2.1.1_2, 6.2.2.0 - 6.2.2.0_1
- IBM Sterling File Gateway 6.2.0.0 - 6.2.0.5_2, 6.2.1.0 - 6.2.1.1_2, 6.2.2.0 - 6.2.2.0_1

## Timeline

- 2026-07-21: advisory: Initial publication by IBM
- 2026-07-28: disclosed: NVD publication date

## References

- [https://www.ibm.com/support/pages/node/7280665](https://www.ibm.com/support/pages/node/7280665)

## Related threats

- [IBM Sterling B2B Integrator and File Gateway sensitive information in logs](https://junglewise.ai/threats/cve-2026-81209-ibm-sterling-b2b-integrator-6-2-1-0-through-6-2-1-2-1-6-2-2-0-6-2)
- [IBM Sterling B2B Integrator and File Gateway improper authorization](https://junglewise.ai/threats/cve-2026-19307-ibm-sterling-b2b-integrator-6-2-1-0-through-6-2-1-2-1-and-6-2-2-0)
- [IBM Sterling File Gateway protocol downgrade via security misconfiguration](https://junglewise.ai/threats/cve-2026-18668-ibm-sterling-file-gateway-6-2-1-0-through-6-2-1-2-1-and-6-2-2-0-6)
- [IBM Sterling B2B Integrator sensitive information disclosure in logs](https://junglewise.ai/threats/cve-2026-12737-ibm-sterling-b2b-integrator-6-2-2-0-through-6-2-2-1-1-and-ibm)
- [IBM Sterling File Gateway authentication bypass via unvalidated SSO header](https://junglewise.ai/threats/cve-2026-75878-ibm-sterling-file-gateway-could-allow-a-remote-attacker-to-bypass)