fix(core): block creation of sensitive URI attributes from ICU messages#67250
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dgp1130 wants to merge 1 commit intoangular:20.3.xfrom
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fix(core): block creation of sensitive URI attributes from ICU messages#67250dgp1130 wants to merge 1 commit intoangular:20.3.xfrom
dgp1130 wants to merge 1 commit intoangular:20.3.xfrom
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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 03da204)
alan-agius4
approved these changes
Feb 24, 2026
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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 03da204)