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ID:12649 - Exploit for Cross-site scripting in PhpSpreadsheet - CVE-2026-35453
ID:12649 - Exploit for Cross-site scripting in PhpSpreadsheet - CVE-2026-35453
Published: April 27, 2026
Vulnerability identifier: #VU127962
Vulnerability risk: Low
CVE-ID: CVE-2026-35453
CWE-ID: CWE-79
Exploitation vector: Remote access
Vulnerable software:
PhpSpreadsheet
PhpSpreadsheet
Link to public exploit:
Vulnerability description
The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.
The vulnerability exists due to insufficient sanitization of user-supplied data within NumberFormat @ Text Substitution in HTML Writer. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.
Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.
Remediation
Install updates from vendor's website.