CVE-2026-34084
CriticalCVSS 9.8Exploitation Probability (EPSS)
Low risk50th percentile - higher than 50% of all known CVEs
Summary
PhpSpreadsheet in multiple versions (up to 1.30.2, 2.0.0-2.1.14, 2.2.0-2.4.3, 3.3.0-3.10.3, 4.0.0-5.5.0) is vulnerable to Remote Code Execution (RCE) via a user-controlled filename argument in IOFactory::load(). An attacker can supply a PHP stream wrapper path (e.g., phar://, ftp://, ssh2.sftp://) that passes the is_file() check in File::assertFile(). The phar:// wrapper triggers deserialization of PHAR metadata, potentially leading to RCE if a suitable gadget is available.
Risk Assessment
An attacker can remotely execute code on the server by submitting a specially crafted file, leading to full application compromise and potentially server takeover.
Recommendation
Immediately upgrade PhpSpreadsheet to one of the patched versions: 1.30.3, 2.1.15, 2.4.4, 3.10.4, or 5.6.0.
Original NVD description (English source)
PhpSpreadsheet is a library for reading and writing spreadsheet files. In versions 1.30.2 and earlier, 2.0.0 through 2.1.14, 2.2.0 through 2.4.3, 3.3.0 through 3.10.3, and 4.0.0 through 5.5.0, when the filename argument to IOFactory::load() is user-controlled, an attacker can supply a PHP stream wrapper path (such as phar://, ftp://, or ssh2.sftp://) that passes the is_file() check in File::assertFile(). The phar:// wrapper triggers deserialization of the PHAR metadata, which can lead to remote code execution if a suitable gadget chain is available in the application. The ftp:// and ssh2.sftp:// wrappers can be used for server-side request forgery. This issue has been fixed in versions 1.30.3, 2.1.15, 2.4.4, 3.10.4, and 5.6.0.