league/commonmark: Bypass AttributesExtension filter via U+000C → stored XSS
Security Advisory
CVE-79
High
The PHP League (CommonMark)
Affected:
- league/commonmark >= 2.7.0, < 2.9.1
Fixed in:
- 2.9.1
Referenced CVEs:
CVE-2026-86431 · 7.2
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