RUSTSEC-2021-0157Published

Incorrect escaping for `url("")` functions in CSS style attributes

Exact source revision recorded 24 Oct 2026 13:19:54 UTC. It does not establish the source's current position. Latest evidence.

Recorded JSON

osv · RUSTSEC-2021-0157

Published

In some cases, quotation marks in CSS url() functions are not escaped. This allows CSS injection. This feature is not enabled by default, so an application is vulnerable if, and only if, the style attribute is allowed and filter_style_properties is used. As an example, this snippet: ```html <div style='background:url("cid:\");EVIL_CSS_HERE;background:url(\"cid:")'> ``` Would erroneously "sanitize" to: ```html <div style='background:url("cid:");EVIL_CSS_HERE;background:url("cid:")'> ``` --- This vulnerability was reported by Uttej Badwane

Source published: 10 Oct 2021 12:00:00 UTC
Source modified: 12 Oct 2026 18:15:01 UTC
Observed here: 24 Oct 2026 13:19:54 UTC
Source terms: OSV · upstream source license applies

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