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Vulnerability record · CVE-2013-4891 · published 21 February 2018

CVE-2013-4891: Codeigniter cross-site scripting vulnerability

Codeigniter · Codeigniter

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.

6.1 CVSS 3.0 Medium EPSS 1.4% · top 28.1% CWE-79 · Cross-site scripting
6.1CVSS 3.0 base score, v2 4.3
1.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 2 tagged exploit
16 Jun 2026Last modified by NVD

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.

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/bcit-ci/CodeIgniter/issues/4020 Issue TrackingThird Party Advisory
https://nealpoole.com/blog/2013/07/codeigniter-21-xss-clean-filter-bypass/ ExploitThird Party Advisory
https://www.codeigniter.com/userguide2/changelog.html Release Notes
https://github.com/bcit-ci/CodeIgniter/issues/4020 Issue TrackingThird Party Advisory
https://nealpoole.com/blog/2013/07/codeigniter-21-xss-clean-filter-bypass/ ExploitThird Party Advisory
https://www.codeigniter.com/userguide2/changelog.html Release Notes

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2013-4891), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.