How severe is CVE-2013-1857?

CVE-2013-1857 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2013-1857 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2013-1857?

CVE-2013-1857 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-2013-1857?

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

When was CVE-2013-1857 published?

CVE-2013-1857 was published on 2013-03-19 and last updated on 2026-06-16.

CVE-2013-1857

CVE-2013-1857 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: 2% (77th 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 helper 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 encoded : (colon) characters in URLs, which makes it easier for remote attackers to conduct cross-site scripting (XSS) attacks via a crafted scheme name, as demonstrated by including a : sequence.

Frequently asked questions

What is CVE-2013-1857?: The sanitize helper 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 encoded : (colon) characters in URLs, which makes it easier for remote attackers to conduct cross-site scripting (XSS) attacks via a crafted scheme name, as demonstrated by including a : sequence.
How severe is CVE-2013-1857?: CVE-2013-1857 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2013-1857 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2013-1857?: CVE-2013-1857 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-2013-1857?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2013-1857 published?: CVE-2013-1857 was published on 2013-03-19 and last updated on 2026-06-16.

References

Affected products (163)

cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*
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:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:1.1.3:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:1.1.4:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:1.1.5:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:1.1.6:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:1.2.0:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:1.2.1:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:1.2.2:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:1.2.3:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:1.2.4:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:1.2.5:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:1.2.6:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:1.9.5:*:*:*:*:*:*:*
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:*:*:*:*:*:*:*

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