CVE-2026-108357: PhpSpreadsheet >= 3.3.0, < 3.10.8, >= 4.0.0, < 5.10.0

Affected technology

PhpSpreadsheet · >= 3.3.0, < 3.10.8, >= 4.0.0, < 5.10.0
PHPOffice

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 4.0): Network (remote) · No privileges required · No user interaction required

What an attacker can do

The source reports that an attacker could disrupt service under the conditions described by the source. Vendor/CNA’s CVSS 4.0 assessment (base score 8.8/10) rates confidentiality impact as low; integrity impact as none; availability impact as high.