---
title: "CVE-2013-4303\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2013-4303?format=md
keywords: index, follow
---

# CVE-2013-4303

Publication date 11 December 2019

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**6.1 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2013-4303?format=md#impact-score)

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## 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.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| mediawiki | 22.04 LTS jammy | Not affected |
| 21.10 impish | Not affected |
| 21.04 hirsute | Not affected |
| 20.10 groovy | Not affected |
| 20.04 LTS focal | Not affected |
| 19.10 eoan | Not affected |
| 19.04 disco | Not affected |
| 18.10 cosmic | Not affected |
| 18.04 LTS bionic | Not affected |
| 17.10 artful | Not affected |
| 17.04 zesty | Not affected |
| 16.10 yakkety | Not affected |
| 16.04 LTS xenial | Not in release |
| 15.10 wily | Not affected |
| 15.04 vivid | Not affected |
| 14.10 utopic | Not affected |
| 14.04 LTS trusty | Not in release |
| 13.10 saucy | Not affected |
| 13.04 raring | Ignored end of life |
| 12.10 quantal | Ignored end of life |
| 12.04 LTS precise | Ignored end of life |
| 10.04 LTS lucid | Ignored end of life |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

6.1 · Medium

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | Low |
  | Privileges required | None |
  | User interaction | Required |
  | Scope | Changed |
  | Confidentiality impact | Low |
  | Integrity impact | Low |
  | Availability impact | None |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 6.1 · Medium |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-4303)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2013-4303)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2013-4303)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2013-4303)

### Other references

* <https://bugzilla.wikimedia.org/show_bug.cgi?id=52746>
* <https://phabricator.wikimedia.org/T54746>
* <https://www.mediawiki.org/wiki/Release_notes/1.19#MediaWiki_1.19.8>
* <https://www.cve.org/CVERecord?id=CVE-2013-4303>