How severe is CVE-2009-3009?

CVE-2009-3009 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2009-3009 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-3009?

CVE-2009-3009 primarily affects Rubyonrails Rails. In total, 14 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-3009?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2009-3009 published?

CVE-2009-3009 was published on 2009-09-08 and last updated on 2026-06-16.

CVE-2009-3009

CVE-2009-3009 is a medium-severity vulnerability in Rubyonrails Rails with a CVSS 2.0 base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 3% (86th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Rubyonrails Rails
Published: 2009-09-08
Last modified: 2026-06-16

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.

Frequently asked questions

What is CVE-2009-3009?: 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.
How severe is CVE-2009-3009?: CVE-2009-3009 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2009-3009 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-3009?: CVE-2009-3009 primarily affects Rubyonrails Rails. In total, 14 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-3009?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2009-3009 published?: CVE-2009-3009 was published on 2009-09-08 and last updated on 2026-06-16.

References

Affected products (14)

cpe:2.3:a:rubyonrails:rails:2.0.0:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:2.0.0:rc1:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:2.0.0:rc2:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:2.0.1:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:2.0.2:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:2.0.4:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:2.1.0:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:2.1.1:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:2.1.2:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:2.2.0:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:2.2.1:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:2.2.2:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:2.3.2:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:2.3.3:*:*:*:*:*:*:*

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