Wikimedia UrlShortener EUVD-2026-41032

| CVE-2026-13706 NONE

Improper Input Validation (CWE-20)

2026-07-01 wikimedia-foundation

GHSA-v4ch-5p7w-6w58

Information Disclosure PHP Urlshortener

Severity by source

Vendor (wikimedia-foundation) PRIMARY

0.0 NONE

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N

vuln.today AI

4.3 MEDIUM

Network-accessible, low complexity; PR:L per provided vector; C:L reflects Information Disclosure tag despite zero-impact provided CVSS, flagged as contradictory.

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

4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (wikimedia-foundation).

CVSS VectorVendor: wikimedia-foundation

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Lifecycle Timeline

1

Analysis Generated

Jul 01, 2026 - 16:06 vuln.today

DescriptionCVE.org

Improper input validation vulnerability in Wikimedia Foundation UrlShortener.

This vulnerability is associated with program files includes/UrlShortenerUtils.Php.

AnalysisAI

Improper input validation in Wikimedia Foundation's UrlShortener extension (includes/UrlShortenerUtils.php) exposes a potential information disclosure path accessible to low-privileged authenticated users over the network. The vulnerability is classified under CWE-20 and tagged as an information disclosure issue, though the provided CVSS 4.0 vector records zero impact across all dimensions - a notable contradiction with the 'Information Disclosure' tag that warrants independent verification. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access

Authenticate to target MediaWiki instance

Delivery

Identify UrlShortener API endpoint

Exploit

Submit crafted/malformed URL input

Execution

Trigger improper validation in UrlShortenerUtils.php

Impact

Obtain disclosed information

Access

Authenticate to target MediaWiki instance

Delivery

Identify UrlShortener API endpoint

Exploit

Submit crafted/malformed URL input

Execution

Trigger improper validation in UrlShortenerUtils.php

Impact

Obtain disclosed information

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Vulnerability AssessmentAI

Exploitation	Exploitation requires the target MediaWiki instance to have the Wikimedia UrlShortener extension installed and active, which is not a default MediaWiki configuration. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	Real-world risk appears low at this time. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	An authenticated low-privileged user submits a crafted URL or malformed input to the UrlShortener extension's API endpoint. Due to insufficient validation in UrlShortenerUtils.php, the application processes the input in an unintended way - potentially disclosing internal URL mappings, resolving restricted short URLs, or leaking path information. …
Remediation	No vendor-released patch or fixed version has been independently confirmed at time of analysis - the sole reference is the Wikimedia Phabricator task T418533 (https://phabricator.wikimedia.org/T418533), which should be monitored for patch availability and exact fixed version. … Detailed patch versions, workarounds, and compensating controls in full report.

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EUVD-2026-41032 vulnerability details – vuln.today

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