CVE-2026-88593Network attack vector

Reflected XSS via unsanitized template parameters

Published Sep 16, 2026 · Updated Sep 22, 2026

Reflected XSS in kkFileView 5.0.0 through 5.0.2 allows remote attackers to execute browser scripts via /onlinePreview. OnlinePreviewController passes the page and kkagent request parameters into FreeMarker templates, which embed them without sanitization in raw JavaScript contexts. Exploitation requires a victim to open a crafted preview request; the injected script then runs in the kkFileView origin and can access browser-visible data or actions available to that context.

CVSS severityUnavailable
Unscored
EPSS probability0.25%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in kkFileView 5.0.0 through 5.0.2 allows remote attackers to execute browser scripts via /onlinePreview. OnlinePreviewController passes the page and kkagent request parameters into FreeMarker templates, which embed them without sanitization in raw JavaScript contexts. Exploitation requires a victim to open a crafted preview request; the injected script then runs in the kkFileView origin and can access browser-visible data or actions available to that context.

The record

CVE
CVE-2026-88593
Published
Sep 16, 2026
Updated
Sep 22, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
Unavailable
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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