CVE-2026-58038: Stored XSS through javascript URLs in SVGs generated by EasyTimeline

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-01 · updated 2026-10-25
Weakness: CWE-79

Description

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.

Affected products

Wikimedia Foundation MediaWiki: from 1.43.0 before 1.43.9; from 1.44.0 before 1.44.6; from 1.45.0 before 1.45.4; 1.46.0-rc0 — fixed in 1.43.9, 1.44.6, 1.45.4

How to fix

Upgrade to a fixed version: Wikimedia Foundation MediaWiki 1.43.9, 1.44.6, 1.45.4. Check the vendor advisory for mitigations.

References

https://phabricator.wikimedia.org/T427611

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