CVE-2026-88593: n/a
kkFileView versions 5.0.0 through 5.0.2 contain a reflected cross-site scripting (XSS) vulnerability in the /onlinePreview endpoint. This occurs because user-controlled parameters are passed to FreeMarker templates without proper sanitization, leading to insertion into raw JavaScript contexts.
AI Analysis
Technical Summary
The vulnerability in kkFileView 5.0.0 through 5.0.2 involves reflected XSS via the /onlinePreview endpoint. The OnlinePreviewController takes user-supplied 'page' and 'kkagent' parameters and injects them into FreeMarker templates without sanitization. These templates then embed the parameters directly into JavaScript code, enabling an attacker to execute arbitrary scripts in the context of the victim's browser.
Potential Impact
Successful exploitation allows an attacker to execute arbitrary JavaScript in the victim's browser when they access the vulnerable endpoint with crafted parameters. This can lead to session hijacking, defacement, or other client-side attacks depending on the victim's environment and privileges.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, avoid exposing the /onlinePreview endpoint to untrusted users or implement input validation and output encoding to prevent injection of malicious scripts.
CVE-2026-88593: n/a
Description
kkFileView versions 5.0.0 through 5.0.2 contain a reflected cross-site scripting (XSS) vulnerability in the /onlinePreview endpoint. This occurs because user-controlled parameters are passed to FreeMarker templates without proper sanitization, leading to insertion into raw JavaScript contexts.
Affected software
pkg:github/sg-summer/kkFileViewRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in kkFileView 5.0.0 through 5.0.2 involves reflected XSS via the /onlinePreview endpoint. The OnlinePreviewController takes user-supplied 'page' and 'kkagent' parameters and injects them into FreeMarker templates without sanitization. These templates then embed the parameters directly into JavaScript code, enabling an attacker to execute arbitrary scripts in the context of the victim's browser.
Potential Impact
Successful exploitation allows an attacker to execute arbitrary JavaScript in the victim's browser when they access the vulnerable endpoint with crafted parameters. This can lead to session hijacking, defacement, or other client-side attacks depending on the victim's environment and privileges.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, avoid exposing the /onlinePreview endpoint to untrusted users or implement input validation and output encoding to prevent injection of malicious scripts.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-09-10T00:00:00.000Z
- State
- PUBLISHED
Threat ID: 6aaad9a055bf5e2cf5f96e2d
Added to database: 09/16/2026, 18:02:08 UTC
Last enriched: 09/16/2026, 18:16:44 UTC
Last updated: 09/16/2026, 18:21:27 UTC
Views: 3
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