PT-2026-63458 · Crates.Io · Ammonia
Published
2026-07-21
·
Updated
2026-07-21
None
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The following SVG will produce a link with a javascript scheme.
If the user clicks this link, they will run it.
xml
<svg xmlns="http://www.w3.org/2000/svg">
<a>
<set attributeName="href" to="javascript:alert('SET XSS')"></set>
<text y="30">Click set</text>
</a>
</svg>Ammonia did not apply attribute filters based on
attributeName,
so the contents of the to, from, and values tags were not sanitized as URLs.Applications that do not explicitly allow either of these tags should not be affected,
since neither are allowed by default.
Discovered by: Younghun Ko (@koyokr)
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Related Identifiers
Affected Products
Ammonia