Information
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Advisory by Netsparker (now Invicti)
Name: XSS & CSRF Vulnerabilities in Gutuma
Software: Gutuma 1.6 and possibly below.
Vendor Homepage: https://sourceforge.net/projects/gutuma/ 
Vulnerability Type: XSS & CSRF
Severity: Critical
Researcher: Omar Kurt
Advisory Reference: NS-13-010

Description
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Gutuma was born out of the need for free mailing list / newsletter software that is geared, not towards mass-marketing companies and spammers, but web developers who need a system that can be easily integrated with an existing web site. It's very easy to install and use, and doesn't even require a database, but it still has lots of powerful features. Internally, Gutuma uses the tried and tested Swift mailer for sending messages, and the SACK library for AJAX subscribe requests.

Details
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Gutuma is affected by XSS and CSRF vulnerabilities in version 1.6. Example PoC's are as follows:

  • XSS
    http://example.com/subscribe.php 
    POST - param:
    subscribe_address='"--></style></script><script>alert(0x000390)</script>
  • CSRF
    http://example.com/settings.php
    It's possible to change administrator's password, email or username
    Form Name: edit_form

You can read the full article about Cross-site Scripting (XSS) vulnerabilities from here:

Advisory Timeline
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05/09/2013 - First contact: No response
09/10/2013 - Advisory Released

Credits
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It has been discovered on testing of Invicti Web Application Security Scanner.

References
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Invicti Advisories : /web-applications-advisories/

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.