What’s Vulnerable › Vulnerabilities

CVE-2013-4891

• Severity: medium (CVSS 6.1 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2018-02-21 · updated 2026-06-16
• Weakness: CWE-79

Description

The xss_clean function in CodeIgniter before 2.1.4 might allow remote attackers to bypass an intended protection mechanism and conduct cross-site scripting (XSS) attacks via an unclosed HTML tag.

Affected products

• CodeIgniter4: before 2.1.4 — fixed in 2.1.4

How to fix

Upgrade to a fixed version: CodeIgniter4 2.1.4. Check the vendor advisory for mitigations.

References

• https://github.com/bcit-ci/CodeIgniter/issues/4020
• https://nealpoole.com/blog/2013/07/codeigniter-21-xss-clean-filter-bypass/
• https://www.codeigniter.com/userguide2/changelog.html
• https://github.com/bcit-ci/CodeIgniter/issues/4020
• https://nealpoole.com/blog/2013/07/codeigniter-21-xss-clean-filter-bypass/
• https://www.codeigniter.com/userguide2/changelog.html

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