Security Bulletin
Summary
Multiple vulnerabilities in the DOMPurify library (CVE-2026-65904, CVE-2026-65911) used by IBM InfoSphere Optim Archive Viewer have been addressed by upgrading the component to version 3.4.12 on Windows and version 3.4.13 on Linux.
Vulnerability Details
CVEID: CVE-2026-65904
DESCRIPTION: DOMPurify through 3.3.3 fails to sanitize DOM elements passed via IN_PLACE mode when the element originates from a different window/realm (e.g., an iframe's contentDocument). A cross-realm instanceof check in the private _isNode() function returns false for foreign-realm nodes, causing DOMPurify to stringify the element (yielding '[object HTMLDivElement]'), silently reset IN_PLACE to false, and return the unsanitized element unchanged with any XSS payloads intact.
CWE: CWE-754: Improper Check for Unusual or Exceptional Conditions
CVSS Source: disclosure@vulncheck.com
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)
CVEID: CVE-2026-65911
DESCRIPTION: In DOMPurify through 3.3.3, function predicates supplied via ADD_ATTR or ADD_TAGS to DOMPurify.sanitize() persist in internal state (EXTRA_ELEMENT_HANDLING) across subsequent sanitize() calls on the same instance. If a later call on the same instance provides ADD_ATTR or ADD_TAGS as an array rather than a function, the previously set function handler is neither cleared nor overwritten, so it continues to approve attacker-controlled attributes or tags. This can allow dangerous event-handler attributes or forbidden tags (bypassing FORBID_TAGS) to survive sanitization, resulting in cross-site scripting. The vendor (Cure53) considers this an edge case outside DOMPurify's threat model; the referenced advisory lists 3.4.0 as the patched version.
CWE: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVSS Source: disclosure@vulncheck.com
CVSS Base score: 6.1
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N)
Affected Products and Versions
| Affected Product(s) | Version(s) |
| IBM InfoSphere Optim Archive Viewer | 11.7.0.0 - 11.7.0.14 |
Remediation/Fixes
Upgrade to IBM InfoSphere Optim Archive Viewer v11.7.0.15 (Fix Pack 15) or later. This release includes dompurify 3.4.12 (Windows) and 3.4.13 (Linux), which resolve the identified vulnerabilities.
Customers should log into Passport Advantage to download the new version. The update is available as part of the following eAssembly:
- eAssembly Name: IBM InfoSphere Optim Archive Viewer v11.7.0.15 Multiplatform English eAssembly
- eAssembly Part Number: G0JNFEN
Download Link: https://www.ibm.com/software/passportadvantage/pao_customer.html
Workarounds and Mitigations
None
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References
Acknowledgement
Change History
27 Oct 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:
26 October 2026
Initial Publish date:
27 October 2026
UID
ibm17294178