CVE-2026-104461

Medium

Description

YesWiki before 4.6.7 contains a stored cross-site scripting vulnerability in the Bazar FileField, which validates only the upload's file extension and never calls HtmlPurifierService::cleanFile, so SVG files are stored verbatim and served inline as image/svg+xml. Authenticated users can submit entries via POST /api/entries/{formId} with SVG files containing script that executes in the wiki origin when the file is opened, enabling administrator session or account compromise.

SeverityMedium

CVSS5.4

Exploit probability—

Product

Yeswiki

PublishedOct 2, 2026

First seenOct 2, 2026

Weakness typeCWE-79Cross-site scripting (XSS)

How to fix

Update

YesWiki yeswiki4.6.7 or later

Vendor advisories

github.com/YesWiki/yeswiki/security/advisories/GHSA-67v5-7pfv-pp9m

Affected products

Product	Affected versions	Fixed in
YesWiki yeswiki	v < 4.6.7	4.6.7

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