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CVE Record

CVE-2017-11666: Cross-site scripting (XSS) vulnerability in js/ViewerPanel.js in the file previewer plugin in Kopano WebApp...

Cross-site scripting (XSS) vulnerability in js/ViewerPanel.js in the file previewer plugin in Kopano WebApp versions 3.3.0 and earlier allows remote attackers to inject arbitrary web script or HTML via a specially crafted previewable file.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2017-11666 is a cross-site scripting flaw in the Kopano WebApp file previewer plugin. A crafted file that can be previewed may cause script or HTML to run in the WebApp context. The public bundle identifies Kopano WebApp 3.3.0 and earlier, but provides no CVSS score or confirmed active exploitation.

Executive priority

Prioritize remediation for internet-facing or broadly used Kopano WebApp deployments because XSS can affect user sessions and trusted mail workflows. Urgency is lower than a confirmed exploited critical issue, but unsupported or exposed deployments should not remain on vulnerable versions.

Technical view

The vulnerability is reported in js/ViewerPanel.js within the Kopano WebApp filepreviewer plugin. The issue allows remote attackers to inject arbitrary web script or HTML through a specially crafted previewable file. The source bundle includes a vendor commit reference, but does not state a fixed release number or detailed remediation instructions.

Likely exposure

Exposure is most likely for organizations running Kopano WebApp 3.3.0 or earlier with the file previewer plugin enabled, especially where users receive or upload previewable files from untrusted sources. The bundle does not identify affected CPEs beyond the CVE description.

Exploitation context

The source states remote attackers can inject web script or HTML via a crafted previewable file. The CVE is not listed as KEV in the provided bundle, and no cited source confirms active exploitation. Practical impact depends on WebApp session context and whether users preview attacker-supplied files.

Researcher notes

Evidence is limited to the CVE description and a vendor commit reference. No CVSS vector, CWE mapping, fixed version, CPE list, or exploitation report is provided in the bundle. Treat product and version scope narrowly: Kopano WebApp 3.3.0 and earlier file previewer plugin.

Mitigation direction

  • Check Kopano vendor guidance for the fixed filepreviewer or WebApp release.
  • Upgrade away from Kopano WebApp 3.3.0 and earlier where vendor guidance supports it.
  • Disable the file previewer plugin if patching is not immediately possible.
  • Limit previewing of files from untrusted senders until remediation is complete.
  • Review web controls such as content security policy as compensating defense.

Validation and detection

  • Inventory Kopano WebApp deployments and identify versions 3.3.0 or earlier.
  • Confirm whether the file previewer plugin is installed and enabled.
  • Compare js/ViewerPanel.js or plugin package state against the referenced vendor commit.
  • Review recent handling of suspicious previewable files from untrusted sources.
  • Validate remediation in a test environment without using production user sessions.
Prepared
Confidence
medium
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

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CVE-2017-11666 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.