CVE-2013-4303: Wikimedia Foundation MediaWiki vulnerability

CVE-2013-4303: includes/libs/IEUrlExtension.php in the MediaWiki API in MediaWiki 1.19.x before 1.19.8, 1.20.x before 1.20...

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.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 6, 2024, 16:38 UTC (UTC+00:00)

Security readout for executives and security teams

This is an old MediaWiki cross-site scripting issue in the API. A remote attacker could abuse a query parameter if a site runs affected MediaWiki versions. Business impact is mainly browser-side compromise risk for wiki users, including administrators, but the bundle provides no CVSS score or active exploitation evidence. Exposure is limited to organizations still running the affected MediaWiki branches and exposing wiki/api.php to users or the internet. Modern or patched MediaWiki deployments are not identified as affected in the bundle. Prioritize remediation for public or administrator-used MediaWiki sites on affected versions. If no such systems exist, document non-exposure and close as historical risk. Mitigation focus: Upgrade MediaWiki 1.19.x to 1.19.8 or later.; Upgrade MediaWiki 1.20.x to 1.20.7 or later.; Upgrade MediaWiki 1.21.x to 1.21.2 or later..

Prepared: Jun 6, 2026, 03:53 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Dec 11, 2019, 18:30 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

3Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
https://bugzilla.wikimedia.org/show_bug.cgi?id=52746CVE reference · x_refsource_MISC
https://exchange.xforce.ibmcloud.com/vulnerabilities/86897CVE reference · x_refsource_MISC

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

Wikimedia FoundationMediaWiki1.19.x before 1.19.8, 1.20.x before 1.20.7, and 1.21.x before 1.21.2Listed

Weakness

CWE details

No CWE listed

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