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PhpSpreadsheet has XSS via NumberFormat @ Text Substitution in HTML Writer

🗓️ 28 Apr 2026 22:50:31Reported by GitHub Advisory DatabaseType 
github
 github
🔗 github.com👁 18 Views

PhpSpreadsheet HTML writer does not escape when a cell uses @ with literal text, enabling XSS.

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08 May 2026 15:29Current
5.7Medium risk
Vulners AI Score5.7
CVSS 3.15.4
CVSS 44.8
EPSS0.00202
SSVC
18