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fkie_cve-2026-102342

ammonia is a Rust library for repairing and securing untrusted HTML. Prior to 3.3.3, 4.0.3, and 4.1.4, applications that allow the SVG animate or set elements can retain an animation whose attributeName targets href and whose value uses the javascript scheme. The sanitized SVG can therefore create a script-bearing link, and a user who clicks the link can execute attacker-controlled script in the application's origin, enabling stored cross-site scripting. This issue is fixed in versions 3.3.3, 4.0.3, and 4.1.4.

GHSA-m6mh-2hw2-555x — Ammonia: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Affected: crates.io: ammonia

The following SVG will produce a link with a `javascript` scheme. If the user clicks this link, they will run it.

```svg <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> ```

### Impact

Allows stored XSS in applications that allow the `animate` and `set` tags.

### Patches

Fixed in 3.3.3, 4.0.3, and 4.1.4

### Workarounds

Do not enable the `animate` or `set` tags.

msrc_CVE-2026-102342 — ammonia allows stored XSS through unsanitized SVG animate and set attributes

msrc_CVE-2026-102342

RUSTSEC-2026-0213 — XSS in ammonia via SVG `animate` and `set` animation tags

Affected: crates.io: ammonia

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.

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**Discovered by:** [Younghun Ko (@koyokr)](https://github.com/koyokr)