CVE-2026-68747
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 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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
2cpe:2.3:a:rrrene:htmlsanitizeex:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:rrrene:htmlsanitizeex:*:*:*:*:*:*:*:*range: >=0.3.1,<1.5.4
- (no CPE)range: from 0.3.1 before 1.4.5 and from 1.5.0-rc.0 before 1.5.4
Patches
Vulnerability mechanics
References
5- cna.erlef.org/cves/CVE-2026-68747.htmlnvdPatchThird Party Advisory
- github.com/rrrene/html_sanitize_ex/commit/0b9f9ad63a7529d4f2c3c1134c371adc3e654308nvdPatch
- osv.dev/vulnerability/EEF-CVE-2026-68747nvdPatchThird Party Advisory
- github.com/rrrene/html_sanitize_ex/security/advisories/GHSA-87v2-pfhj-r5x7nvdBroken Link
- github.com/rrrene/html_sanitize_ex/commit/c311a499db0b0baef06493fb3cfeb730c0f18f28nvd
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