Information
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Advisory by Netsparker (now Invicti)
Name: Stored XSS vulnerability in Omeka 2.6
Affected Software: Omeka
Affected Versions: 2.6
Homepage: http://omeka.org
Vulnerability: Stored XSS
Severity: Medium
Status: Fixed
CVE-ID: CVE-2018-13423
CVSS Score (3.0) : CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N
Invicti Advisory Reference: NS-18-004

Technical Details
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Injection Request
URL:/admin/items/edit/{id}
Parameter Name : add-to-tag
Parameter Type : POST
Attack Pattern : "><img src=z onmouseover=alert(1)>

Identification Request
URL:/admin/items/edit/{id}
Parameter Type: GET

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

Advisory Timeline
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23th April 2018 - First Contact
1st May 2018 - Vendor Fixed
9th July 2018 - Advisory Released

Credits & Authors
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These issues have been discovered by Zekvan Arslan 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.