CVE-2017-1000481: Plone - Login Redirection Vulnerability
Summary
CVE-2017-1000481: When you visit a page where you need to login, Plone 2.5-5.1rc1 sends you to the login form with a 'came_from' parameter set to the previous url. Affects plone across 2 version ranges.
>= 2.5, < 4.3.16
>= 5, < 5.1.0
Fixed in 4.3.16 or 5.1.0, depending on the release line you run. How to fix ↓
Also tracked for
- products-cmfplone · PyPI
- products-cmfplone · PyPI
The same CVE-2017-1000481 is tracked separately for each ecosystem and vendor. Its fix information is the same; the package and affected versions differ.
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Background
Plone is an open-source content management system built on top of the Zope application server. It provides an intuitive interface for managing websites and supports various features such as user authentication, content creation, and access control. Plone versions 2.5 to 5.1rc1 are affected by a login redirection vulnerability.
Vulnerability Detail
The login redirection vulnerability in Plone occurs when a user visits a page that requires authentication. Plone redirects the user to the login form with a 'came_from' parameter set to the previous URL. After successful login, the user is redirected back to the original page. An attacker can exploit this behavior by crafting a malicious link that tricks the user into logging in and redirecting to a site controlled by the attacker. This can lead to various attacks, such as phishing or executing malicious JavaScript. Although Plone has measures in place to prevent most of these attacks, some additional methods of tricking Plone into accepting a malicious link were discovered and addressed with a hotfix.
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, < 4.3.164.3.16pip install --upgrade "plone==4.3.16" -
>= 5, < 5.1.05.1.0pip install --upgrade "plone==5.1.0"
Tip — Not sure which release line you're on? Vulert can find the fix for the version you are using. Scan free →
Workaround
No workaround is available for this vulnerability. It is recommended to apply the provided fix or upgrade to the patched versions.
Conclusion
The login redirection vulnerability in Plone can be exploited by attackers to trick users into interacting with malicious sites or executing malicious JavaScript. Users are advised to upgrade to the patched versions or apply the provided hotfix to mitigate the vulnerability. For further support on vulnerability remediation, contact DevNack.com.
See every vulnerability recorded for plone →
FAQ
Plone is an open-source content management system built on top of the Zope application server. It provides an intuitive interface for managing websites and supports various features such as user authentication, content creation, and access control.
When a user visits a page that requires authentication, Plone redirects them to the login form with a 'came_from' parameter set to the previous URL. After successful login, the user is redirected back to the original page. An attacker can exploit this behavior by crafting a malicious link that tricks the user into logging in and redirecting to a site controlled by the attacker.
The login redirection vulnerability in Plone can be exploited for various attacks, including phishing and executing malicious JavaScript. It can lead to users unknowingly interacting with a malicious site, thinking they are still on the original Plone site.
Plone versions 2.5 to 5.1rc1 are affected by the login redirection vulnerability. Users should upgrade to the patched versions or apply the provided hotfix to mitigate the vulnerability.
To fix the vulnerability, users should upgrade to version 4.3.16 or later for Plone 2.5 to 4.x, or upgrade to version 5.1.0 or later for Plone 5.x. The Plone community has provided a hotfix that addresses the additional methods of tricking Plone into accepting a malicious link.
References
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