How severe is CVE-2013-1855?

CVE-2013-1855 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2013-1855 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2013-1855?

CVE-2013-1855 primarily affects Redhat Enterprise Linux. In total, 163 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2013-1855?

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

When was CVE-2013-1855 published?

CVE-2013-1855 was published on 2013-03-19 and last updated on 2026-06-16.

CVE-2013-1855

CVE-2013-1855 is a medium-severity vulnerability in Redhat Enterprise Linux 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% (84th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Redhat Enterprise Linux
Published: 2013-03-19
Last modified: 2026-06-16

Description

The sanitize_css method in lib/action_controller/vendor/html-scanner/html/sanitizer.rb in the Action Pack component in Ruby on Rails before 2.3.18, 3.0.x and 3.1.x before 3.1.12, and 3.2.x before 3.2.13 does not properly handle \n (newline) characters, which makes it easier for remote attackers to conduct cross-site scripting (XSS) attacks via crafted Cascading Style Sheets (CSS) token sequences.

Frequently asked questions

What is CVE-2013-1855?: The sanitize_css method in lib/action_controller/vendor/html-scanner/html/sanitizer.rb in the Action Pack component in Ruby on Rails before 2.3.18, 3.0.x and 3.1.x before 3.1.12, and 3.2.x before 3.2.13 does not properly handle \n (newline) characters, which makes it easier for remote attackers to conduct cross-site scripting (XSS) attacks via crafted Cascading Style Sheets (CSS) token sequences.
How severe is CVE-2013-1855?: CVE-2013-1855 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2013-1855 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2013-1855?: CVE-2013-1855 primarily affects Redhat Enterprise Linux. In total, 163 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2013-1855?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2013-1855 published?: CVE-2013-1855 was published on 2013-03-19 and last updated on 2026-06-16.

References

Affected products (163)

cpe:2.3:a:rubyonrails:rails:3.2.0:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:3.2.0:rc1:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:3.2.0:rc2:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:3.2.1:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:3.2.2:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:3.2.2:rc1:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:3.2.3:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:3.2.3:rc1:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:3.2.3:rc2:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:3.2.4:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:3.2.4:rc1:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:3.2.5:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:3.2.6:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:3.2.7:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:3.2.8:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:3.2.9:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:3.2.10:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:3.2.11:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:3.2.12:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:0.9.1:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:0.9.2:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:0.9.3:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:0.9.4:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:0.9.4.1:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:0.10.0:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:0.10.1:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:0.11.0:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:0.11.1:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:0.12.0:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:0.12.1:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:0.13.0:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:0.13.1:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:0.14.1:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:0.14.2:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:0.14.3:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:0.14.4:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:1.0.0:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:1.1.0:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:1.1.1:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:1.1.2:*:*:*:*:*:*:*

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