CVE-2026-104461

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.

CVSS Vector

References

• https://github.com/YesWiki/yeswiki/security/advisories/GHSA-67v5-7pfv-pp9m
• https://www.vulncheck.com/advisories/yeswiki-before-4.6.7-stored-xss-via-unsanitized-svg-upload-in-bazar-filefield