# CVE-2026-18668: Protection Mechanism Failure vulnerability affects IBM Sterling File Gateway

Status: published. Published: 2026-11-08. Updated: 2026-11-08.

IBM Sterling File Gateway 6.2.1.0 through 6.2.1.2_1 and  6.2.2.0 - 6.2.2.1_1 could allow a remote attacker to perform protocol downgrade attacks due to a security misconfiguration.

## Remediation

- fix: ProductVersionAPARRemediation & Fix IBM Sterling File Gateway 6.2.1.0 - 6.2.1.2_1IT49752 Apply 6.2.1.3  IBM Sterling File Gateway 6.2.2.0 - 6.2.2.1_1IT49752 Apply 6.2.2.2







The IIM versions of 6.2.1.3 and 6.2.2.2 are available on  Fix Central http://www-933.ibm.com/support/fixcentral/swg/selectFixes . 



The container versions of 6.2.1.3 and 6.2.2.2 are available in IBM Entitled Registry

  *  cp.icr.io/cp/ibm-b2bi for IBM Sterling File Gateway (source: CNA: ibm)
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: ibm) — https://www.ibm.com/support/pages/node/7294084

## Affected products and versions

- IBM / Sterling File Gateway: ≥ 6.2.1.0; ≤ 6.2.1.2_1, 6.2.2.0 - 6.2.2.1_1 (affected, semver). Source: CNA: ibm

## Severity and prioritization

- CVSS 3.1: 6.5 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N; source: CNA: ibm

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-693

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://www.ibm.com/support/pages/node/7294084 (CNA: ibm; vendor-advisory, patch)

## Provenance

- CNA: ibm: https://www.cve.org/CVERecord?id=CVE-2026-18668; retrieved 2026-11-08; source updated 2026-11-08

Revision: 56e516641c2f2e2d1f2243a5dd0b98f162b1613bc3846893718d6d723a49fa35

Canonical: https://y2.dev/cve/CVE-2026-18668

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