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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👁 3 Views

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

Related
Detection
Refs
ReporterTitlePublishedViews
Family
ATTACKERKB
CVE-2026-40296
6 May 202620:48
attackerkb
Circl
CVE-2026-40296
7 May 202602:45
circl
CNNVD
PhpSpreadsheet 跨站脚本漏洞
6 May 202600:00
cnnvd
CVE
CVE-2026-40296
6 May 202620:48
cve
Cvelist
CVE-2026-40296 PhpSpreadsheet vulnerable to XSS in HTML writer via custom number format codes
6 May 202620:48
cvelist
EUVD
EUVD-2026-28221
6 May 202620:48
euvd
NVD
CVE-2026-40296
6 May 202622:16
nvd
OSV
GHSA-HRMW-QPRP-WGMC PhpSpreadsheet has XSS via number format code with @ text placeholder bypasses htmlspecialchars in HTML writer
28 Apr 202622:57
osv
Positive Technologies
PT-2026-35878
28 Apr 202600:00
ptsecurity
Snyk
Cross-site Scripting (XSS)
28 Apr 202622:57
snyk
Rows per page
Vulners
Node
phpofficephpspreadsheetRange1.30.3composer
OR
phpofficephpspreadsheetRange2.0.02.1.15composer
OR
phpofficephpspreadsheetRange2.2.02.4.4composer
OR
phpofficephpspreadsheetRange3.3.03.10.4composer
OR
phpofficephpspreadsheetRange4.0.05.6.0composer

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08 May 2026 19:32Current
5.5Medium risk
Vulners AI Score5.5
CVSS 3.15.4
EPSS0.00012
SSVC
3