Sanitize vulnerable to Cross-site Scripting via insufficient neutralization of `style` element content

TRUNG BÌNH 6.1CVE-2023-36823 · GHSA-f5ww-cq3m-q3g7 · Công bố 06/07/2023 · cập nhật 17/06/2026

Tóm tắt nhanh

CVE-2023-36823 là lỗ hổng mức TRUNG BÌNH (CVSS 6.1) ảnh hưởng sanitize, sanitize (sanitize project).
Xác suất bị khai thác trong 30 ngày tới (EPSS): 0.71%, cao hơn 53.7% các lỗ hổng khác.
Cách xử lý: cập nhật lên 6.0.2 hoặc mới hơn.

Gói / sản phẩm	Phiên bản bị ảnh hưởng	Phiên bản đã vá
sanitize RubyGems	`≥ 3.0.0, < 6.0.2`	`6.0.2`
sanitize sanitize_project	`≥ 3.0.0, < 6.0.2`	`6.0.2`

Mô tả

Impact

Using carefully crafted input, an attacker may be able to sneak arbitrary HTML and CSS through Sanitize >= 3.0.0, < 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 XSS (cross-site scripting) or other undesired behavior when the malicious HTML and CSS are rendered in a browser.

Patches

Sanitize >= 6.0.2 performs additional escaping of CSS in style element content, which fixes this issue.

Workarounds

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.

Credit

This issue was found by @cure53 during an audit of a project that uses Sanitize and was reported by one of that project's maintainers. Thank you!

Mô tả của NVD

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.