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CVE-2026-40296 PhpSpreadsheet vulnerable to XSS in HTML writer via custom number format codes

🗓️ 06 May 2026 20:48:34Reported by GoogleType 
osv
 osv
🔗 osv.dev👁 1 Views

PhpSpreadsheet writer XSS via custom number formats using @, bypassing escaping and enabling stored XSS.

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08 Jul 2026 08:13Current
5.6Medium risk
Vulners AI Score5.6
CVSS 3.15.4
EPSS0.00225
1