Cross Site Scripting (XSS)

SEC Consult Vulnerability Lab Security Advisory < 20170117-0 >


title: Cross Site Scripting (XSS)

product: Recommend Page extension for TYPO3 CMS (pb_recommend_page)

vulnerable version: <=2.0.3

fixed version: -

CVE number: -

impact: Medium


found: 2016-10-21

by: Siddhartha Tripathy (Office Singapore)

SEC Consult Vulnerability Lab


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Vendor description:


"The TYPO3 Universe offers highly flexible, scaleable and customizable products for

Web Content Management, providing the basis for websites, intranets and web & mobile

applications worldwide - always with a focus on the current needs of businesses and

public institutions."


"The Recommend Page extension Generates a form to send a link to a friend

(Recommend page, tip a friend), uses Swift Mailer"





Business recommendation:


By exploiting the XSS vulnerability, an attacker can include HTML- or

JavaScript code at the affected web page. The code is executed in the

browser of users if they visit the manipulated site. The vulnerability

can be used to change the contents of the displayed site, redirect to

other sites or steal user credentials. Additionally, users are potential

victims of browser exploits and JavaScript Trojan Horses.


SEC Consult recommends not to use the extension until a thorough security

review has been performed by security professionals. Furthermore it seems

that the extension is not maintained anymore.



Vulnerability overview/description:


1) Cross Site Scripting (XSS)

The "Recommend page" extension for the TYPO3 CMS has a parameter

"tx_pbrecommendpage_pi1[url]" which is not properly sanitized. An attacker can

inject malicious HTML/JavaScript content which can cause harm to the users.



Proof of concept:


1) Cross Site Scripting (XSS)

The "Recommend Page" extension generates a form to send a link to a friend,

where a user can add a link to send to other users. There an attacker can

inject a malicious JavaScript to harm other users.


The proof of concept URL as been removed as the vendor did not provide a patch yet.



Vulnerable / tested versions:


The XSS vulnerability exists within the "pb_recommend_page" extension for the TYPO3 CMS.

The version of the extension could not be verified during the crash test.


It is assumed that the latest version v2.0.3 from November 2014 is affected as well

as all previous versions.



Vendor contact timeline:


2016-10-26: Contacting vendor via

2016-11-10: Response from TYPO3 Security team that they will investigate and get

it fixed upon confirmation

2016-11-26: Requesting status update from TYPO3 security team, no answer

2016-12-05: Requesting status update again, no answer

2016-12-22: Requesting status update again, no answer

2017-01-11: Contacted TYPO3 security team again, no answer

2017-01-17: Public release of advisory





There is no patch from the vendor available. It is recommended not to use this

extension until a thorough audit has been performed and the issues are fixed.





Sanitize user supplied content or create only one static pages to recommend.



Advisory URL:






SEC Consult Vulnerability Lab


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S. Tripathy / @2017