How severe is CVE-2009-3009?

No CVSS score has been assigned to CVE-2009-3009 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2009-3009?

CVE-2009-3009 affects the following packages: actionpack (RubyGems), actionpack (RubyGems), activesupport (RubyGems), activesupport (RubyGems). Ecosystems affected: RubyGems.

How do I fix CVE-2009-3009?

Update actionpack to 2.2.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2009-3009 is resolved across your whole dependency graph.

How do I detect CVE-2009-3009 in my RubyGems dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for actionpack, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2009-3009 if there is no patch (or I can't update yet)?

Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Is CVE-2009-3009 actively exploited in the wild?

No public exploit code has been indexed for CVE-2009-3009 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2009-3009?

CVE-2009-3009 has an EPSS (Exploit Prediction Scoring System) score of 3.0%, placing it in the 88th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2009-3009?

CVE-2009-3009 is classified as Cross-site Scripting (XSS) (CWE-79). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was CVE-2009-3009 published, and has it been updated?

CVE-2009-3009 was published on September 8, 2009 and was last updated on April 10, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

💎 RubyGems

Not in CISA KEV

CVE-2009-3009 — actionpack

CVE-2009-3009 is a Cross-site Scripting (XSS) vulnerability in actionpack. A fix is available for actionpack — see the affected versions and patch details below.

Cross site scripting that affects rails

Also known asGHSA-8qrh-h9m2-5fvf

Published

Sep 8, 2009

Updated

Apr 10, 2026

Affected

4 pkgs

Patched

4 / 4

Exploits

None indexed

Exploitation data as of Nov 7, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

3.0%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs88th percentile — riskier than 88% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Real-World Exposure

4 pkgs affected

💎actionpack💎actionpack💎activesupport💎activesupport

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects RubyGems packages — download data is not available via public APIs for these ecosystems.

Description

Cross-site scripting (XSS) vulnerability in Ruby on Rails 2.x before 2.2.3, and 2.3.x before 2.3.4, allows remote attackers to inject arbitrary web script or HTML by placing malformed Unicode strings into a form helper.

Affected Packages

4 total 4 fixed

Ecosystem	Package	Vulnerable range	Fix
💎RubyGems	`actionpack`	≥ 2.0.0&&< 2.2.3	2.2.3`bundle update actionpack --conservative`
💎RubyGems	`actionpack`	≥ 2.3.0&&< 2.3.4	2.3.4`bundle update actionpack --conservative`
💎RubyGems	`activesupport`	≥ 2.0.0&&< 2.2.3	2.2.3`bundle update activesupport --conservative`
💎RubyGems	`activesupport`	≥ 2.3.0&&< 2.3.4	2.3.4`bundle update activesupport --conservative`

Affected Products

1 product · 14 configurations

Application

railsrubyonrails

12 versions

2.0.02.0.12.0.22.0.42.1.02.1.12.1.22.2.02.2.12.2.22.3.22.3.3

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for actionpack, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update actionpack to 2.2.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2009-3009 is resolved across your whole dependency graph.
Workarounds
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

O3 Security · Impact-Aware SCA

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