EUVD-2026-41022
GHSA-pm32-8hr8-567h
Severity by source
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
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).
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
Lifecycle Timeline
2DescriptionCVE.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
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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External POC / Exploit Code
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