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lxml_html_clean

lxml_html_clean is a project for HTML cleaning functionalities copied from `lxml.html.clean`. Prior to version 0.4.4, the <base> tag passes through the default Cleaner configuration. While page_structure=True removes html, head, and title tags, there is no specific handling for <base>, allowing an attacker to inject it and hijack relative links on the page. This issue has been patched in version 0.4.4.

The vulnerability identified as CVE-2026-28350 affects the lxml_html_clean project, a Python library used for cleaning HTML content. This library is a fork or copy of lxml.html.clean and provides functionalities to sanitize HTML input. Prior to version 0.4.4, the default Cleaner configuration does not specifically handle the <base> HTML tag. While other structural tags such as <html>, <head>, and <title> are removed when the page_structure option is enabled, the <base> tag is allowed to pass through unfiltered. The <base> tag in HTML defines the base URL for all relative URLs in the document. An attacker can exploit this by injecting a malicious <base> tag, causing all relative links on the page to redirect to attacker-controlled URLs. This improper encoding or escaping of output corresponds to CWE-116, which involves failure to properly sanitize or encode output data. The vulnerability impacts confidentiality and integrity by enabling link hijacking, potentially leading to phishing or redirection attacks. The CVSS v3.1 score is 6.1 (medium severity), reflecting network attack vector, low attack complexity, no privileges required, but user interaction needed, and a scope change due to affecting linked resources. The vulnerability was published on March 5, 2026, and has been patched in lxml_html_clean version 0.4.4. There are no known exploits in the wild at this time.

Detailed information about CVE-2026-28350: CWE-116: Improper Encoding or Escaping of Output in fedora-python lxml_html_clean affecting fedora-python lxml_html_c

CVE-2026-28350: CWE-116: Improper Encoding or Escaping of Output in fedora-python lxml_html_clean - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-28350: CWE-116: Improper Encoding or Escaping of Output in fedora-python lxml_html_clean

lxml_html_clean is a project for HTML cleaning functionalities copied from `lxml.html.clean`. Prior to version 0.4.4, the _has_sneaky_javascript() method strips backslashes before checking for dangerous CSS keywords. This causes CSS Unicode escape sequences to bypass the @import and expression() filters, allowing external CSS loading or XSS in older browsers. This issue has been patched in version 0.4.4.

The vulnerability identified as CVE-2026-28348 affects the lxml_html_clean library, a Python project providing HTML cleaning functionalities derived from lxml.html.clean. The core issue lies in the _has_sneaky_javascript() method, which attempts to detect and filter dangerous CSS constructs such as @import and expression() that could be used for malicious purposes. However, prior to version 0.4.4, this method improperly strips backslashes before performing keyword checks, allowing CSS Unicode escape sequences to evade detection. This bypass enables attackers to inject external CSS or execute cross-site scripting (XSS) attacks, particularly in older browsers that interpret these escape sequences. The vulnerability is categorized under CWE-116, indicating improper encoding or escaping of output. The CVSS v3.1 base score is 6.1, reflecting a medium severity level with network attack vector, low attack complexity, no privileges required, but requiring user interaction. The scope is changed, indicating that the vulnerability can affect components beyond the initially vulnerable library. Although no known exploits have been reported, the flaw poses a tangible risk to applications relying on vulnerable versions of lxml_html_clean for sanitizing HTML content. The issue was publicly disclosed and patched in version 0.4.4, which corrects the filtering logic to properly handle CSS Unicode escapes and prevent bypasses.

Detailed information about CVE-2026-28348: CWE-116: Improper Encoding or Escaping of Output in fedora-python lxml_html_clean affecting fedora-python lxml_html_c

CVE-2026-28348: CWE-116: Improper Encoding or Escaping of Output in fedora-python lxml_html_clean - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-28348: CWE-116: Improper Encoding or Escaping of Output in fedora-python lxml_html_clean


CVE-2026-28350: CWE-116: Improper Encoding or Escaping of Output in fedora-python lxml_html_cleanCVE-2026-28350 0 lxml_html_clean is a project for HTML cleaning functionalities copied from `lxml.html.clean`. Prior to version 0.4.4, the <base> tag passes through the default Cleaner configuration. While page_structure=True removes html, head, and title tags, there is no specific handling for <base>, allowing an attacker to inject it and hijack relative links on the page. This issue has been patched in version 0.4.4. MediumVulnerabilityUnited StatesGermanyUnited Kingdom+7#cve #cve-2026-28350 #cwe-116 Join the discussion	CVE Database V5	03/05/2026, 19:49:55 UTC Added: 03/05/2026, 20:09:25 UTC
CVE-2026-28348: CWE-116: Improper Encoding or Escaping of Output in fedora-python lxml_html_cleanCVE-2026-28348 0 lxml_html_clean is a project for HTML cleaning functionalities copied from `lxml.html.clean`. Prior to version 0.4.4, the _has_sneaky_javascript() method strips backslashes before checking for dangerous CSS keywords. This causes CSS Unicode escape sequences to bypass the @import and expression() filters, allowing external CSS loading or XSS in older browsers. This issue has been patched in version 0.4.4. MediumVulnerabilityUnited StatesGermanyUnited Kingdom+8#cve #cve-2026-28348 #cwe-116 Join the discussion	CVE Database V5	03/05/2026, 19:49:26 UTC Added: 03/05/2026, 20:09:25 UTC

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