CVE-2012-5504: Cross-Site Scripting (XSS) Vulnerability in Plone
Summary
CVE-2012-5504: Plone Cross-site scripting Vulnerability. Affects plone across 2 version ranges.
< 4.2.3
>= 4.3a0, < 4.3b1
Fixed in 4.2.3 or 4.3b1, depending on the release line you run. How to fix ↓
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Background
Plone is an open-source content management system built on top of the Zope application server. It provides a robust and flexible platform for creating and managing websites. Plone is written in Python and offers a wide range of features, including a powerful security model and extensibility through add-ons. However, versions before 4.2.3 and 4.3 before beta 1 are susceptible to a cross-site scripting (XSS) vulnerability.
Vulnerability Detail
The XSS vulnerability in Plone, identified as CVE-2012-5504, allows remote attackers to inject arbitrary web script or HTML into the application. The specific vectors through which the attack can be carried out are unspecified. This vulnerability can have severe consequences, as it enables attackers to execute malicious code within the context of a user's browser, potentially leading to session hijacking, data theft, or other forms of unauthorized access.
How To Fix
Latest published version: 6.2.2 as of 23 Oct 2026
pip install --upgrade "plone==6.2.2"Upgrading to it may include breaking changes; the versions below are the minimum fixed release for this vulnerability.
If you can't move to the latest
The minimum fixed version depends on the release line you run.
-
< 4.2.34.2.3pip install --upgrade "plone==4.2.3" -
>= 4.3a0, < 4.3b14.3b1pip install --upgrade "plone==4.3b1"
Tip — Not sure which release line you're on? Vulert can find the fix for the version you are using. Scan free →
Workaround
If upgrading to a secure version is not immediately feasible, a temporary workaround can be implemented to mitigate the risk. This can involve implementing input validation and output encoding to prevent the execution of malicious scripts. However, it is important to note that workarounds may not provide complete protection and should be considered temporary measures until a proper upgrade can be performed.
Conclusion
The CVE-2012-5504 vulnerability in Plone exposes the application to cross-site scripting (XSS) attacks, allowing remote attackers to inject malicious scripts or HTML. To mitigate this risk, it is crucial to upgrade to Plone version 4.2.3 or later, or version 4.3 beta 1 or later, which include patches to address the vulnerability. Implementing input validation and output encoding as temporary workarounds can provide some protection until the upgrade is performed. For further assistance and support in vulnerability remediation, please contact DevNack.com.
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FAQ
Cross-site scripting (XSS) is a type of security vulnerability that allows attackers to inject malicious scripts into web pages viewed by other users. This can lead to various attacks, such as stealing sensitive information, manipulating website content, or hijacking user sessions.
The Plone XSS vulnerability can be exploited by remote attackers who can find and exploit the unspecified vectors through which arbitrary web script or HTML can be injected into the application. By injecting malicious code, attackers can execute scripts within the context of a user's browser, potentially compromising their session or stealing sensitive information.
The Plone XSS vulnerability can have severe consequences, including session hijacking, data theft, unauthorized access to sensitive information, and manipulation of website content. Attackers can exploit this vulnerability to execute arbitrary code within the context of a user's browser, potentially compromising their entire session and exposing them to further attacks.
No, only versions of Plone before 4.2.3 and 4.3 before beta 1 are affected by this XSS vulnerability. It is recommended to upgrade to a secure version to ensure protection against this exploit.
Yes, a fix for the Plone XSS vulnerability is available in versions 4.2.3 and later, as well as version 4.3 beta 1 and later. Upgrading to these secure versions will address the vulnerability and protect the application against potential attacks.
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