Assessment
Why it matters
EPSS is 0.6%; technical severity is CVSS 9.4.
IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.8 IBM WebSphere Application Server Liberty is vulnerable to an authentication bypass when the rtcomm-1.0 or rtcommGateway-1.0 feature is enabled.
Who should care
- Teams operating Websphere Application Server
- Vulnerability and exposure management teams
- Security operations teams monitoring exploitation activity
Response plan
What I would do
- Confirm whether Websphere Application Server is present in the environment.
- Identify affected versions and establish whether vulnerable services are exposed or reachable.
- IBM Security advisory 7283488
- Review relevant security telemetry for evidence of attempted or successful exploitation.
- Document the remediation decision and track it to verified completion.
Treatment intelligence
Remediation intelligence
Vendor sources are listed before government and third-party guidance. Confirm product applicability and change prerequisites before deployment.
Verification noteAutomated link verification has not completed for this guidance yet.
Technical details
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
- CWE
- CWE-306
- Affected versions
- IBM Websphere Application Server (Start Including 17.0.0.3, End Excluding 26.0.0.9)
- Fixed versions
- IBM Websphere Application Server (Fixed from 26.0.0.9)
- Published
- 13 August 2026
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
Signal timeline
- CVE published
- Latest EPSS score: 0.6%
- Signal calculated at 14