CVE-2026-104461 YesWiki before 4.6.7 Stored XSS via Unsanitized SVG Upload in Bazar FileField
Authenticated users can upload malicious SVG files to execute scripts in the wiki origin, potentially compromising administrator accounts.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-104461?
CVE-2026-104461 is a medium-severity cross-site scripting vulnerability in yeswiki, published on 2 Oct 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-104461?
How do I fix CVE-2026-104461?
No fix has been published for CVE-2026-104461 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-104461 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-104461 exists.
Sources
Also known as GHSA-67v5-7pfv-pp9m, GHSA-c49r-h57h-8wfx.