CVE-2012-5501: Open Source Vulnerability in Plone
Summary
CVE-2012-5501: Plone Arbitrary File Read. 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 (CMS) built on top of the Zope application server. It provides a robust and flexible platform for creating and managing websites, intranets, and web applications. Plone allows users to store and retrieve various types of content, including files and images. However, a vulnerability in Plone versions before 4.2.3 and 4.3 beta 1 allows remote attackers to read arbitrary BLOBs (Files and Images) stored on custom content types through a specially crafted URL.
Vulnerability Detail
The vulnerability (CVE-2012-5501) in Plone allows unauthorized access to BLOBs (Files and Images) stored on custom content types. By exploiting this vulnerability, remote attackers can retrieve sensitive information that should not be accessible to them. This can lead to unauthorized disclosure of confidential data, such as user credentials, personal information, or proprietary files. The vulnerability arises from a flaw in the 'at_download.py' module, which fails to properly validate access permissions before serving BLOBs to remote clients.
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 the latest version of Plone is not immediately feasible, a temporary workaround can be implemented by modifying the 'at_download.py' module. The following code snippet demonstrates the necessary changes:
# Apply access control checks
if not authorized:
raise Unauthorized()
# Serve the requested BLOB
...
Conclusion
The vulnerability in Plone versions before 4.2.3 and 4.3 beta 1 allows remote attackers to read arbitrary BLOBs stored on custom content types. To mitigate this risk, it is crucial to upgrade to Plone version 4.2.3 or later. Alternatively, a temporary workaround can be implemented by modifying the 'at_download.py' module. For further assistance and support in vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability allows remote attackers to read arbitrary BLOBs stored on custom content types, potentially leading to unauthorized disclosure of sensitive information.
Plone versions before 4.2.3 and 4.3 beta 1 are affected by this vulnerability.
You can use the Vulert Playground at Vulert Scanner to check if your Plone installation is affected by this vulnerability. Simply provide your Pipfile.lock file, and Vulert will analyze it for any known vulnerabilities.
Yes, the Plone development team has released fixes for this vulnerability in Plone version 4.2.3 and later. It is recommended to upgrade to the latest version to mitigate the risk.
Yes, if upgrading to the latest Plone version is not immediately feasible, you can apply a temporary workaround by modifying the 'at_download.py' module as described in the 'how_to_fix' section.
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