What is CVE-2011-0447?

CVE-2011-0447 is a vulnerability in Rubyonrails Rails, classified under Cross-Site Request Forgery (CSRF). Published 2011-02-14.

Is CVE-2011-0447 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

CSRF in Rubyonrails Rails

CVE-2011-0447

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.

Vulnerability class: CSRF (Cross-Site Request Forgery)

Published 2011-02-14 · last modified 2026-06-16.

CVSS v2 metric

CVSS v2 base score 6.8 (Medium). Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.014 (71.8th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 72nd percentile — 71.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000

Affected products

Rubyonrails Rails — versions 2.1.0, 2.1.1, 2.1.2

Weakness classification (CWE)

CWE-352 — Cross-Site Request Forgery (CSRF)

Public proof-of-concept exploits

tdunning/github-advisory-parser

References

www.vupen.com/english/advisories/2011/0587 (vdb-entry)
weblog.rubyonrails.org/2011/2/8/csrf-protection-bypass-in-ruby-on-rails (Patch, Vendor Advisory)
www.securitytracker.com/id (vdb-entry)
lists.fedoraproject.org/pipermail/package-announce/2011-March/055088.html (vendor-advisory)
www.securityfocus.com/bid/46291 (vdb-entry)
www.debian.org/security/2011/dsa-2247 (vendor-advisory)
groups.google.com/group/rubyonrails-security/msg/c22ea1668c0d181c (mailing-list, Patch)
lists.fedoraproject.org/pipermail/package-announce/2011-April/057650.html (vendor-advisory)
secunia.com/advisories/43274 (third-party-advisory)
www.vupen.com/english/advisories/2011/0877 (vdb-entry)

Frequently asked questions

What is CVE-2011-0447?: CVE-2011-0447 is a vulnerability in Rubyonrails Rails, classified under Cross-Site Request Forgery (CSRF). Published 2011-02-14.
Is CVE-2011-0447 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.