CVE-2017-1000483: Plone - Accessing Private Content via str.format in Through-the-Web Templates and Scripts

plone Updated 02 Oct 2025

Summary

13/05/2022

Disclosed on

CVE-2017-1000483

CVE

Yes i

Fix available

High

Severity

6.5

CVSS Score

CVE-2017-1000483: Plone Unauthorized Access Vulnerability. Affects plone across 2 version ranges.

>= 2.5, < 4.3.16 >= 5.0, < 5.1.0

Fixed in 4.3.16 or 5.1.0, 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, intranets, and web applications. Plone is written in Python and has a large community of developers and users. This vulnerability affects Plone versions 2.5 to 5.1rc1.

Vulnerability Detail

The vulnerability allows an attacker to access private content through the use of the str.format method in through-the-web templates and scripts. This vulnerability was initially addressed with a hotfix, but this specific part of the fix is relevant for Plone versions 4 and 5. The str.format method was introduced in Python 2.6, so it is only applicable to Plone versions 4 and 5. The impact of this vulnerability is unauthorized access to private content, which can lead to exposure of sensitive information.

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.

>= 2.5, < 4.3.16 4.3.16
```
pip install --upgrade "plone==4.3.16"
```
>= 5.0, < 5.1.0 5.1.0
```
pip install --upgrade "plone==5.1.0"
```

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Workaround

There is no specific workaround mentioned for this vulnerability.

Conclusion

The vulnerability in Plone allows unauthorized access to private content, potentially exposing sensitive information. It is crucial to upgrade to the fixed versions of Plone to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.

See every vulnerability recorded for plone →

FAQ

What is the impact of this vulnerability?

The impact of this vulnerability is unauthorized access to private content, which can lead to exposure of sensitive information.

Which versions of Plone are affected by this vulnerability?

Plone versions 2.5 to 5.1rc1 are affected by this vulnerability.

Is there a workaround available for this vulnerability?

No specific workaround is mentioned for this vulnerability.

How can I fix this vulnerability?

To fix this vulnerability, it is recommended to upgrade to a fixed version of Plone. For Plone 4, upgrade to version 4.3.16 or later. For Plone 5, upgrade to version 5.1.0 or later.