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PhpSpreadsheet has XSS via number format code with @ text placeholder bypasses htmlspecialchars in HTML writer

🗓️ 28 Apr 2026 22:57:13Reported by GitHub Advisory DatabaseType 
github
 github
🔗 github.com👁 19 Views

PhpSpreadsheet HTML writer escapes can be bypassed by custom number formats with @, enabling cross site scripting.

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08 May 2026 19:32Current
5.5Medium risk
Vulners AI Score5.5
CVSS 3.15.4
EPSS0.00225
SSVC
19