Information
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Advisory by Netsparker (now Invicti)
Name: Open Redirection Vulnerability in GetSimpleCMS
Affected Software: GetSimpleCMS
Affected Versions: 3.3.13
Homepage: http://get-simple.info/
Vulnerability: Open Redirection
Severity: Medium
Status: Not Fixed
CVSS Score (3.0): AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Invicti Advisory Reference: NS-18-056

Technical Details
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URL  : http://GetSimpleCMS-3.3.13/admin/index.php?redirect=http://r87.com/?localhost/  Parameter Name : redirect
Parameter Type  : GET
Attack Pattern  : http://r87.com/?localhost/  
Github: https://github.com/GetSimpleCMS/GetSimpleCMS/issues/1300

For more information on Open Redirection vulnerabilities read the article Open Redirection.

Advisory Timeline
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12th November 2018 - First Contact
12th November 2018 - Disclosed Publicly at Request
14th Febuary 2019 - Advisory Released

Credits & Authors
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These issues have been discovered by Mithat Gögebakan 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.