CVE-2026-66843lowCWE-829

CVE-2026-66843: falha de baixa gravidade em rrrene html_sanitize_ex

html_sanitize_ex HTML5 scrubber keeps attacker-supplied `<object>` elements, allowing untrusted content embedding

Publicada em · Atualizada em

Seguir esta CVE+ Monitorar html sanitize ex+ Monitorar html_sanitize_ex

Aviso por e-mail quando ela entrar no KEV, ganhar PoC pública ou subir de nota.

8Vexday Risk Score

Sem sinal de exploração. Nenhum artefato público de exploração conhecido até agora.

ssvc Trackcvss 2.3epss 0.5%
Inclusion of Functionality from Untrusted Control Sphere vulnerability in the HTML5 scrubber in rrrene html_sanitize_ex allows a remote attacker to load a document of their choosing into a trusted page via the data attribute of an <object> element in sanitized HTML. object is the one URI-bearing element in lib/html_sanitize_ex/scrubber/html5.ex never registered through allow_tag_with_uri_attributes/3, and its only guard is a prefix match on lowercase "javascript:", so mixed-case variants, data: URIs, protocol-relative URLs and same-origin paths all survive. This is not unconditional cross-site scripting. A javascript: URL does not execute through <object data> in current browsers, data: documents load in an opaque origin, and host-origin script execution additionally requires the application to serve attacker-controlled content from a same-origin path. This issue affects html_sanitize_ex: from 0.3.1 before 1.4.5 and from 1.5.0-rc.0 before 1.5.3.
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Produtos afetados
rrrene · html_sanitize_ex
CVEs relacionadas — rrrene html_sanitize_ex

No mesmo produto, das mais perigosas para as menos.

CVE-2026-68750HIGHQuadratic sibling re-flattening in the html_sanitize_ex traversal engine allows CPU-exhaustion denial of serviceEPSS 0.8%CVE-2026-68749HIGHQuadratic regex backtracking in the html_sanitize_ex CSS scrubber allows CPU-exhaustion denial of serviceEPSS 0.8%CVE-2026-66829LOWhtml_sanitize_ex HTML5 scrubber keeps attacker-supplied meta refresh, allowing forced cross-origin redirectionEPSS 0.6%CVE-2026-68747LOWCSS sanitizer allowlist bypass in html_sanitize_ex via non-declaration inputEPSS 0.4%CVE-2026-66370MEDIUMhtml_sanitize_ex HTML5 scrubber keeps attacker-supplied form-association attributes, allowing form hijackingEPSS 0.4%