Description
PhpSpreadsheet is a pure PHP library for reading and writing spreadsheet files. Prior to 1.30.7, 2.1.19, 2.4.8, 3.10.8, and 5.10.0, XmlScanner::scan in src/PhpSpreadsheet/Reader/Security/XmlScanner.php uses a DOCTYPE detection pattern that accounts for NUL-byte interleaving but not ISO-2022 escape sequences in XLSX XML parts. The escape sequences prevent the scanner from matching the declaration, and XML charset normalization then removes the escape bytes before parsing, exposing a valid DOCTYPE and entity definitions. Processing an attacker-controlled XLSX can therefore cause entity-expansion denial of service on supported PHP versions and can permit local file access or SSRF on PHP before 8.0 or when LIBXML_NOENT is enabled. This issue is fixed in versions 1.30.7, 2.1.19, 2.4.8, 3.10.8, and 5.10.0.
References10
- github.com/PHPOffice/PhpSpreadsheet/commit/299993894dce37aa3b64…
- github.com/PHPOffice/PhpSpreadsheet/commit/89f455c133e1a7e2d4ab…
- github.com/PHPOffice/PhpSpreadsheet/commit/980b5c294493856f1a25…
- github.com/PHPOffice/PhpSpreadsheet/commit/9a0b48622ebfe93fa48c…
- github.com/PHPOffice/PhpSpreadsheet/commit/da13f40e8760d599b0e8…
- github.com/PHPOffice/PhpSpreadsheet/releases/tag/1.30.7
- github.com/PHPOffice/PhpSpreadsheet/releases/tag/2.1.19
- github.com/PHPOffice/PhpSpreadsheet/releases/tag/2.4.8
- github.com/PHPOffice/PhpSpreadsheet/releases/tag/3.10.8
- github.com/PHPOffice/PhpSpreadsheet/releases/tag/5.10.0
Metrics
- CVSS 4.0
-
8.8
HIGH
Score source: CNA
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - EPSS — exploit probability
- 1% percentile: 50 · as of 8 November 2026
- CWE
- CWE-611CWE-776
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