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Doug Parker 7f9de3c118 fix(core): block creation of sensitive URI attributes from ICU messages
Translators are not allowed to write HTML which creates URI attributes. I opted to ban any values going into an attribute at all, to prevent even links to malicious content, rather than just sanitizing URIs.

I also converted this blocklist into an allowlist. Now, we only allowing setting known attributes (while sanitizing URI attributes). This significantly reduces risk of missing a vulnerable attribute and does not require an exhaustive list of all potential attributes.

BREAKING CHANGE: Angular now only applies known attributes from HTML in translated ICU content. Unknown attributes are dropped and not rendered.

(cherry picked from commit 03da204b6d)
2026-02-25 08:22:14 -08:00
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