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Wikimedia Timeline EUVDEUVD-2026-41022

| CVE-2026-58038 NONE
Cross-site Scripting (XSS) (CWE-79)
2026-07-01 wikimedia-foundation GHSA-pm32-8hr8-567h
XSS PHP Timeline

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
5.4 MEDIUM

Network-accessible stored XSS requiring low-privilege edit access (PR:L); victim must load the page (UI:R); scope change to other users' browser sessions with session theft potential (C:L/I:L).

3.1 AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/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: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

2
Patch available
Jul 01, 2026 - 17:01 EUVD
Analysis Generated
Jul 01, 2026 - 16:02 vuln.today

DescriptionCVE.org

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation timeline.

This vulnerability is associated with program files includes/Timeline.Php, scripts/EasyTimeline.Pl.

This issue affects timeline: from * before 1.46.0, 1.45.4, 1.44.6, 1.43.9.

AnalysisAI

Stored cross-site scripting in the Wikimedia Foundation Timeline extension exposes MediaWiki installations to session hijacking and credential theft. The flaw exists in Timeline.php and EasyTimeline.pl, where user-supplied timeline markup syntax is not properly neutralized before HTML output, allowing an authenticated wiki editor to inject arbitrary JavaScript executed in other users' browsers. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate to MediaWiki instance with editor account
Delivery
Craft malicious XSS payload in timeline tag syntax
Exploit
Save payload to high-traffic wiki page
Execution
Victim loads page rendering malicious timeline
Persist
Injected JavaScript executes in victim browser
Impact
Exfiltrate session token to attacker-controlled endpoint
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Vulnerability AssessmentAI

Exploitation The Timeline MediaWiki extension must be installed and enabled on the target MediaWiki instance. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The provided CVSS 4.0 vector (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) is anomalous and almost certainly a data entry error or placeholder: all impact metrics (VC/VI/VA/SC/SI/SA) are set to None, yielding an effective score of 0.0, which contradicts the confirmed CWE-79 classification. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker registers an account on a target MediaWiki instance (or exploits anonymous editing if enabled), then edits a high-traffic wiki page to embed a malicious JavaScript payload within a timeline tag block processed by EasyTimeline.pl. When any authenticated user - including administrators - visits the page, their browser executes the injected script, enabling the attacker to silently exfiltrate session cookies to an external collector and take over the victim's wiki account. …
Remediation Upgrade the Timeline MediaWiki extension to the patched releases: 1.43.9, 1.44.6, 1.45.4, or 1.46.0, selecting the branch that matches the deployed MediaWiki version. … Detailed patch versions, workarounds, and compensating controls in full report.
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EUVD-2026-41022 vulnerability details – vuln.today
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