CVE-2026-68747
Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') vulnerability in the CSS scrubber in rrrene html_sanitize_ex allows an unauthenticated remote attacker to inject CSS at-rules, including an import of a remote stylesheet, into a page served to other users. HtmlSanitizeEx.Scrubber.CSS.scrub/1 applies its property and value allowlist through a Regex.replace over substrings matching a property: value declaration pattern, so input that does not match that pattern is never inspected and is copied to the output unchanged. @import url(//attacker.example/style.css); survives, while the same URL inside a background: url(...) declaration is removed. Element boundaries are resolved before the scrubber runs, so injected content does not escape the <style> element and no script executes. This issue affects html_sanitize_ex: from 0.3.1 before 1.5.4.
- Affected products
- Html Sanitize Ex
- Rrrene Htmlsanitizeex
- < 1.5.4
- CVSS 3.1
- 6.1 MEDIUM
- EPSS
- 0.3% (17th percentile)
- Weakness
- CWE-74
- NVD status
- Analyzed
- Published
- 2026-08-06
- Attack patterns
- CAPEC-148
Workaround
Sanitize with basic_html/1, markdown_html/1 or strip_tags/1, none of which allow elements, or define a custom scrubber that omits it. A Content-Security-Policy style-src directive that permits no external stylesheet origins stops an injected @import from loading, though injected inline rules still apply.
No indexed exploits for CVE-2026-68747 yet
Our index is partial: it proves presence, never absence
No exploit for CVE-2026-68747 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.