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Security Bulletin: Platform Navigator and Automation Assets in IBM Cloud Pak for Integration are vulnerable to vulnerability in Handlebars

Security Bulletin


Summary

Platform Navigator and Automation Assets in IBM Cloud Pak for Integration are vulnerable to vulnerability in Handlebars. (CVE-2026-33916) This has been addressed.

Vulnerability Details

CVEID:   CVE-2026-33916
DESCRIPTION:   Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, `resolvePartial()` in the Handlebars runtime resolves partial names via a plain property lookup on `options.partials` without guarding against prototype-chain traversal. When `Object.prototype` has been polluted with a string value whose key matches a partial reference in a template, the polluted string is used as the partial body and rendered without HTML escaping, resulting in reflected or stored XSS. Version 4.7.9 fixes the issue. Some workarounds are available. Apply `Object.freeze(Object.prototype)` early in application startup to prevent prototype pollution. Note: this may break other libraries, and/or use the Handlebars runtime-only build (`handlebars/runtime`), which does not compile templates and reduces the attack surface.
CWE:   CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVSS Source:   NVD
CVSS Base score:   4.7
CVSS Vector:   (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N)

Affected Products and Versions

Affected Product(s)Version(s)

Platform Navigator in IBM Cloud Pak for Integration (CP4I)

16.1.0 to 16.1.0.23
16.1.1
16.1.2
16.1.3.0 to 16.1.3.4

Automation Assets in IBM Cloud Pak for Integration (CP4I)

4.0.0-sc2 to 4.0.20-sc2
4.1.0
4.2.0
4.3.0 to 4.3.3

Remediation/Fixes

Platform Navigator in IBM Cloud Pak for Integration

Upgrade Platform Navigator to either the SC2 or Mod version:

SC2: 16.1.0.24 using the Operator upgrade process described in the IBM Documentation https://www.ibm.com/docs/en/cloud-paks/cp-integration/16.1.0?topic=upgrading-platform-ui

Mod: 16.1.3.5 using the Operator upgrade process described in the IBM Documentation https://www.ibm.com/docs/en/cloud-paks/cp-integration/16.1.3?topic=upgrading-platform-ui

 

Automation Assets in IBM Cloud Pak for Integration

Upgrade Automation Assets Operator to either the SC2 or Mod version:

SC2: 4.0.21-sc2 using the Operator upgrade process described in the IBM Documentation https://www.ibm.com/docs/en/cloud-paks/cp-integration/16.1.0?topic=upgrading

Mod: 4.3.4 using the Operator upgrade process described in the IBM Documentation https://www.ibm.com/docs/en/cloud-paks/cp-integration/16.1.3?topic=upgrading

Workarounds and Mitigations

None

Get Notified about Future Security Bulletins

References

Off

Acknowledgement

Change History

25 Jun 2026: Initial Publication

*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.

Disclaimer

According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES ""AS IS"" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY. In addition to other efforts to address potential vulnerabilities, IBM periodically updates the record of components contained in our product offerings. As part of that effort, if IBM identifies previously unidentified packages in a product/service inventory, we address relevant vulnerabilities regardless of CVE date. Inclusion of an older CVEID does not demonstrate that the referenced product has been used by IBM since that date, nor that IBM was aware of a vulnerability as of that date. We are making clients aware of relevant vulnerabilities as we become aware of them. "Affected Products and Versions" referenced in IBM Security Bulletins are intended to be only products and versions that are supported by IBM and have not passed their end-of-support or warranty date. Thus, failure to reference unsupported or extended-support products and versions in this Security Bulletin does not constitute a determination by IBM that they are unaffected by the vulnerability. Reference to one or more unsupported versions in this Security Bulletin shall not create an obligation for IBM to provide fixes for any unsupported or extended-support products or versions.

Document Location

Worldwide

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Document Information

Modified date:
25 June 2026

Initial Publish date:
25 June 2026

UID

ibm17277909