What is CVE-2011-0447?

CVE-2011-0447 is a medium-severity cross-site request forgery (CSRF) vulnerability in actionpack (rubygems), affecting versions >= 2.1.0, < 2.3.11. It is fixed in 2.3.11, 3.0.4. A victim's authenticated browser session is used to submit forged requests to an application that cannot distinguish them from legitimate ones.

Which versions of actionpack are affected by CVE-2011-0447?

actionpack (rubygems) versions >= 2.1.0, < 2.3.11 is affected.

Is there a fix for CVE-2011-0447?

Yes. CVE-2011-0447 is fixed in 2.3.11, 3.0.4. Upgrade to this version or later.

Is CVE-2011-0447 exploitable, and should I be worried?

Whether CVE-2011-0447 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.

What actually determines whether CVE-2011-0447 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-2011-0447?

Upgrade: actionpack to 2.3.11 or later, actionpack to 3.0.4 or later.

CVE-2011-0447 in actionpack

Q: Which versions of actionpack are affected by CVE-2011-0447?

actionpack (rubygems) versions >= 2.1.0, < 2.3.11 is affected.

Q: Is there a fix for CVE-2011-0447?

Yes. CVE-2011-0447 is fixed in 2.3.11, 3.0.4. Upgrade to this version or later.

Q: Is CVE-2011-0447 exploitable, and should I be worried?

Whether CVE-2011-0447 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.

Q: What actually determines whether CVE-2011-0447 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.

Q: How do I fix CVE-2011-0447?

Upgrade: actionpack to 2.3.11 or later, actionpack to 3.0.4 or later.

Summary

actionpack Cross-Site Request Forgery vulnerability

Ruby on Rails 2.1.x, 2.2.x, and 2.3.x before 2.3.11, and 3.x before 3.0.4, does not properly validate HTTP requests that contain an X-Requested-With header, which makes it easier for remote attackers to conduct cross-site request forgery (CSRF) attacks via forged (1) AJAX or (2) API requests that leverage "combinations of browser plugins and HTTP redirects," a related issue to CVE-2011-0696.

Impact

A victim's authenticated browser session is used to submit forged requests to an application that cannot distinguish them from legitimate ones. Typical impact: state-changing actions performed as the victim without their consent.

Affected versions

actionpack (>= 2.1.0, < 2.3.11) actionpack (>= 3.0.0, < 3.0.4)

Security releases

actionpack → 2.3.11 (rubygems) actionpack → 3.0.4 (rubygems)

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.

Already deployed Kodem?

See it in your environment New to Kodem? Get a demo →

Remediation advice

Upgrade the following packages to resolve this vulnerability:

actionpack to 2.3.11 or later; actionpack to 3.0.4 or later

Kodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.

Frequently Asked Questions

What is CVE-2011-0447? CVE-2011-0447 is a medium-severity cross-site request forgery (CSRF) vulnerability in actionpack (rubygems), affecting versions >= 2.1.0, < 2.3.11. It is fixed in 2.3.11, 3.0.4. A victim's authenticated browser session is used to submit forged requests to an application that cannot distinguish them from legitimate ones.
Which versions of actionpack are affected by CVE-2011-0447? actionpack (rubygems) versions >= 2.1.0, < 2.3.11 is affected.
Is there a fix for CVE-2011-0447? Yes. CVE-2011-0447 is fixed in 2.3.11, 3.0.4. Upgrade to this version or later.
Is CVE-2011-0447 exploitable, and should I be worried? Whether CVE-2011-0447 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-2011-0447 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-2011-0447?
- Upgrade actionpack to 2.3.11 or later
- Upgrade actionpack to 3.0.4 or later

Other vulnerabilities in actionpack

CVE-IDSeverityPackage summary

CVE-2026-33167Lowactionpack: Rails has a possible XSS vulnerability in its Action Pack debug exceptions CVE-2024-54133Lowactionpack: Possible Content Security Policy bypass in Action Dispatch CVE-2024-47887Mediumactionpack: Possible ReDoS vulnerability in HTTP Token authentication in Action Controller CVE-2024-41128Mediumactionpack: Possible ReDoS vulnerability in query parameter filtering in Action Dispatch CVE-2024-28103Mediumactionpack: Missing security headers in Action Pack on non-HTML responses