CVE-2026-108359: PhpSpreadsheet < 1.30.7, >= 2.0.0, < 2.1.19, >= 2.2.0, < 2.4.8, >= 3.3.0, < 3.10.8, >= 4.0.0, < 5.10.0

Affected technology

PhpSpreadsheet · < 1.30.7, >= 2.0.0, < 2.1.19, >= 2.2.0, < 2.4.8, >= 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

Vendor/CNA’s CVSS 4.0 assessment (base score 8.7/10) rates confidentiality and integrity impact as none; availability impact as high. The description does not specify what an attacker can achieve beyond these rated impacts.