CVE-2013-4303

Name: CVE-2013-4303
Creator: NVD / NIST
Published: 2019-12-11T19:15:12.217+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 1.53%

Last modified Jun 16, 2026

CVE-2013-4303 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. includes/libs/IEUrlExtension.php in the MediaWiki API in MediaWiki 1.19.x before 1.19.8, 1.20.x before 1.20.7, and 1.21.x before 1.21.2 does not properly detect extensions when there are an even number of "." (period) characters in a string, which allows remote attackers to conduct cross-site scripting (XSS) attacks via the siprop parameter in a query action to wiki/api.php.. EPSS estimates a 1.53% chance of exploitation in the next 30 days.

Description

includes/libs/IEUrlExtension.php in the MediaWiki API in MediaWiki 1.19.x before 1.19.8, 1.20.x before 1.20.7, and 1.21.x before 1.21.2 does not properly detect extensions when there are an even number of "." (period) characters in a string, which allows remote attackers to conduct cross-site scripting (XSS) attacks via the siprop parameter in a query action to wiki/api.php.

Metrics

CVSS 3.1

6.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

1.53%

71.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Mediawiki	Mediawiki	>= 1.19.0, < 1.19.8
Mediawiki	Mediawiki	>= 1.20.0, < 1.20.7
Mediawiki	Mediawiki	>= 1.21.0, < 1.21.2

References

http://lists.wikimedia.org/pipermail/mediawiki-announce/2013-September/000133.htmlMailing List, Patch, Vendor Advisory
http://seclists.org/oss-sec/2013/q3/553Mailing List, Third Party Advisory
http://www.securityfocus.com/bid/62194Third Party Advisory, VDB Entry
https://bugzilla.wikimedia.org/show_bug.cgi?id=52746Exploit, Issue Tracking, Patch, Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/86897Third Party Advisory, VDB Entry
http://lists.wikimedia.org/pipermail/mediawiki-announce/2013-September/000133.htmlMailing List, Patch, Vendor Advisory
http://seclists.org/oss-sec/2013/q3/553Mailing List, Third Party Advisory
http://www.securityfocus.com/bid/62194Third Party Advisory, VDB Entry
https://bugzilla.wikimedia.org/show_bug.cgi?id=52746Exploit, Issue Tracking, Patch, Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/86897Third Party Advisory, VDB Entry

Timeline

Published: Dec 11, 2019
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2013-4303?

How severe is CVE-2013-4303?

CVE-2013-4303 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 1.53% probability of exploitation in the next 30 days.

How do I fix CVE-2013-4303?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2013-4303?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST