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CVE-2023-36823

Status Candidate

Overview

Sanitize is an allowlist-based HTML and CSS sanitizer. Using carefully crafted input, an attacker may be able to sneak arbitrary HTML and CSS through Sanitize starting with version 3.0.0 and prior to version 6.0.2 when Sanitize is configured to use the built-in "relaxed" config or when using a custom config that allows `style` elements and one or more CSS at-rules. This could result in cross-site scripting or other undesired behavior when the malicious HTML and CSS are rendered in a browser. Sanitize 6.0.2 performs additional escaping of CSS in `style` element content, which fixes this issue. Users who are unable to upgrade can prevent this issue by using a Sanitize config that doesn't allow `style` elements, using a Sanitize config that doesn't allow CSS at-rules, or by manually escaping the character sequence `</` as `<\/` in `style` element content.

Related Files

Debian Security Advisory 5616-1
Posted Feb 6, 2024
Authored by Debian | Site debian.org

Debian Linux Security Advisory 5616-1 - It was discovered that ruby-sanitize, a whitelist-based HTML sanitizer, insufficiently sanitized style elements, which may result in cross-site scripting.

tags | advisory, xss, ruby
systems | linux, debian
advisories | CVE-2023-36823
SHA-256 | cb1891138c71065ba8a31de094547c27038e14dbb35d632d940934fd3474f59c
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