# CVE-2026-18668: IBM Sterling File Gateway protocol downgrade via security misconfiguration

Source: 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  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-08. Updated: 2026-11-08  
License: CC BY 4.0 with a link back

CVE-2026-18668 · Severity: medium · CVSS 6.5 · Published 2026-11-08

IBM Sterling File Gateway is a secure file transfer solution used for business-to-business data exchange. A security misconfiguration allows remote attackers to downgrade the encryption protocol used for connections, potentially exposing sensitive data in transit without requiring authentication or user interaction.

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

## Quick answers

**Is CVE-2026-18668 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-18668 being exploited in the wild.

**How severe is CVE-2026-18668?** Medium severity, with a CVSS score of 6.5, published 8 November 2026.

**Which products and versions are affected?** IBM Sterling File Gateway 6.2.1.0 through 6.2.1.2_1, 6.2.2.0 through 6.2.2.1_1.

**Is there a fix for CVE-2026-18668?** Yes: fixed in Sterling File Gateway 6.2.1.3, 6.2.2.2. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-18668 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-18668?** Check whether you run IBM Sterling File Gateway 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.

## How to fix

- Fixed in Sterling File Gateway 6.2.1.3, 6.2.2.2

## Technical details

The vulnerability is a protection mechanism failure (CWE-693) caused by security misconfiguration that enables protocol downgrade attacks. It affects versions 6.2.1.0 through 6.2.1.2_1 and 6.2.2.0 through 6.2.2.1_1, with network-based attack vector requiring no authentication or privileges. An attacker can downgrade the protocol to weaker encryption standards, compromising confidentiality and integrity of transmitted data.

## Affected products

- IBM Sterling File Gateway 6.2.1.0 through 6.2.1.2_1, 6.2.2.0 through 6.2.2.1_1

## Timeline

- 2026-10-26: disclosed

## References

- [https://www.ibm.com/support/pages/node/7294084](https://www.ibm.com/support/pages/node/7294084)

## 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 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)
- [IBM Sterling File Gateway improper access control](https://junglewise.ai/threats/cve-2026-19290-ibm-sterling-file-gateway-improper-access-control)