CVE-2026-28348
Description
A flaw was found in lxml_html_clean. The _has_sneaky_javascript() method incorrectly strips backslashes before checking for dangerous CSS keywords. This allows CSS Unicode escape sequences to bypass @import and expression() filters. A remote attacker could exploit this to achieve external CSS loading or Cross-Site Scripting (XSS) in older browsers, potentially leading to arbitrary script execution in the context of the user's browser.
Statement
Red Hat Product Security has determined that this vulnerability does not affect any currently supported Red Hat product. This assessment may evolve based on further analysis and discovery. For more information about this vulnerability and the products it affects, please see the linked references.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Understanding the Weakness (CWE)
Other
Technical Impact: Varies by Context
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