Is there a patch available for EUVD-2026-41099?

Yes, a patch is available for EUVD-2026-41099. Update the affected software to the latest version immediately.

MediaWiki UrlShortener EUVD-2026-41099

Q: What is the CVSS score of EUVD-2026-41099?

EUVD-2026-41099 has a CVSS 4.0 base score of 6.9 (Medium). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.3%.

| CVE-2026-58520 MEDIUM

URL Redirection to Untrusted Site (Open Redirect) (CWE-601)

2026-07-01 wikimedia-foundation

GHSA-q84p-w2wj-782m

Open Redirect Mediawiki Urlshortener Extension

6.9

CVSS 4.0 · Vendor: wikimedia-foundation

Severity by source

Vendor (wikimedia-foundation) PRIMARY

6.9 MEDIUM

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

vuln.today AI

6.1 MEDIUM

Open redirect exploitation requires victim to click a crafted link (UI:R); redirect crosses to external domain establishing scope change (S:C); no availability impact applies to this class of vulnerability.

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

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

Primary rating from Vendor (wikimedia-foundation).

CVSS VectorVendor: wikimedia-foundation

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Lifecycle Timeline

Patch available

Jul 01, 2026 - 19:02 EUVD

Analysis Generated

Jul 01, 2026 - 18:23 vuln.today

DescriptionCVE.org

URL redirection to untrusted site ('open redirect') vulnerability in The Wikimedia Foundation Mediawiki - UrlShortener Extension allows Cross-Site Flashing.

This issue affects Mediawiki - UrlShortener Extension: from * before 1.43.9, 1.44.6, 1.45.4.

AnalysisAI

Open redirect exploitation in the Wikimedia Foundation MediaWiki UrlShortener Extension enables unauthenticated network attackers to craft shortened URLs hosted on trusted MediaWiki domains that silently redirect victims to arbitrary external sites, facilitating phishing and Cross-Site Flashing attacks. All versions of the extension prior to 1.43.9, 1.44.6, and 1.45.4 across their respective branches are affected. …

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Risk assessment & exploitation conditions
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Threat intelligence from 22 sources
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access

Identify MediaWiki site with UrlShortener Extension enabled

Delivery

Submit request to create shortened URL targeting malicious domain

Exploit

Distribute crafted short link via phishing channel

Execution

Victim clicks trusted-domain short URL

Persist

Extension resolves redirect to attacker-controlled site

Impact

Victim exposed to phishing or malicious content

Access

Identify MediaWiki site with UrlShortener Extension enabled

Delivery

Submit request to create shortened URL targeting malicious domain

Exploit

Distribute crafted short link via phishing channel

Execution

Victim clicks trusted-domain short URL

Persist

Extension resolves redirect to attacker-controlled site

Impact

Victim exposed to phishing or malicious content

Vulnerability AssessmentAI

Exploitation	The UrlShortener Extension must be installed and active on the target MediaWiki instance, and the instance must be running a version prior to 1.43.9, 1.44.6, or 1.45.4. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	The provided CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N) scores 6.9 (Medium) and flags no user interaction as required. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	An attacker registers a shortened URL on a high-trust MediaWiki deployment (such as a Wikipedia project wiki) that maps to a malicious external domain hosting a credential-harvesting phishing page. The attacker distributes the resulting short link through email or social media, exploiting the trusted parent domain reputation to bypass user suspicion and URL-filtering controls. …
Remediation	Upgrade the MediaWiki UrlShortener Extension to the patched release corresponding to your MediaWiki branch: 1.43.9, 1.44.6, or 1.45.4. … Detailed patch versions, workarounds, and compensating controls in full report.

Threat intelligence, references, and detailed analysis are available after sign-in.

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EUVD-2026-41099 vulnerability details – vuln.today

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