Summary
Products.CMFPlone Open Redirect Vulnerability
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. After you login, you get redirected to the page you tried to view before. An attacker might try to abuse this by letting you click on a specially crafted link. You would login, and get redirected to the site of the attacker, letting you think that you are still on the original Plone site. Or some javascript of the attacker could be executed. Most of these types of attacks are already blocked by Plone, using the isURLInPortal check to make sure we only redirect to a page on the same Plone site. But a few more ways of tricking Plone into accepting a malicious link were discovered, and fixed with this hotfix.
Impact
Untrusted input controls a URL used for redirection, which can forward users to attacker-controlled sites. Typical impact: phishing and credential harvesting via a trusted domain.
CVE-2017-1000481 has a CVSS score of 6.1 (Medium). The vector is network-reachable, no privileges required, and user interaction required. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (4.3.17, 5.0.10, 5.1.0, 4.3.16); upgrading removes the vulnerable code path.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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Products.CMFPlone to 4.3.17 or later; Products.CMFPlone to 5.0.10 or later; Products.CMFPlone to 5.1.0 or later; Plone to 4.3.16 or later; Plone to 5.1.0 or later
Kodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.
Frequently Asked Questions
- What is CVE-2017-1000481? CVE-2017-1000481 is a medium-severity open redirect vulnerability in Products.CMFPlone (pip), affecting versions < 4.3.17. It is fixed in 4.3.17, 5.0.10, 5.1.0, 4.3.16. Untrusted input controls a URL used for redirection, which can forward users to attacker-controlled sites.
- How severe is CVE-2017-1000481? CVE-2017-1000481 has a CVSS score of 6.1 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
- Which packages are affected by CVE-2017-1000481?
Products.CMFPlone(pip) (versions < 4.3.17)Plone(pip) (versions >= 2.5, < 4.3.16)
- Is there a fix for CVE-2017-1000481? Yes. CVE-2017-1000481 is fixed in 4.3.17, 5.0.10, 5.1.0, 4.3.16. Upgrade to this version or later.
- Is CVE-2017-1000481 exploitable, and should I be worried? Whether CVE-2017-1000481 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2017-1000481 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2017-1000481?
- Upgrade
Products.CMFPloneto 4.3.17 or later - Upgrade
Products.CMFPloneto 5.0.10 or later - Upgrade
Products.CMFPloneto 5.1.0 or later - Upgrade
Ploneto 4.3.16 or later - Upgrade
Ploneto 5.1.0 or later
- Upgrade