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GHSA-HRMW-QPRP-WGMC PhpSpreadsheet has XSS via number format code with @ text placeholder bypasses htmlspecialchars in HTML writer

🗓️ 28 Apr 2026 22:57:13Reported by GoogleType 
osv
 osv
🔗 osv.dev👁 11 Views

PhpSpreadsheet HTML writer bypasses escaping via custom number formats containing @, enabling XSS.

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08 May 2026 19:50Current
5.9Medium risk
Vulners AI Score5.9
CVSS 3.15.4
EPSS0.00225
11