Description
PhpSpreadsheet is a pure PHP library for reading and writing spreadsheet files. From 3.3.0 until 3.10.8 and 5.10.0, Reader\Xml passes stored SpreadsheetML XML through XmlScanner::scan in Xml::canRead and Xml::trySimpleXMLLoadStringPrivate, while Xml::unentity decodes numeric entities only after each DOCTYPE pattern check. A double-encoded less-than character is reduced by the first callback to another encoded character and by the second callback to a literal less-than sign, so SimpleXML receives an unchecked DOCTYPE and entity declaration. Processing attacker-controlled SpreadsheetML XML can cause entity-expansion denial of service 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 3.10.8 and 5.10.0.
References5
- github.com/PHPOffice/PhpSpreadsheet/commit/89f455c133e1a7e2d4ab…
- github.com/PHPOffice/PhpSpreadsheet/commit/980b5c294493856f1a25…
- github.com/PHPOffice/PhpSpreadsheet/releases/tag/3.10.8
- github.com/PHPOffice/PhpSpreadsheet/releases/tag/5.10.0
- github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-rx…
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
- 0% percentile: 40 · as of 8 November 2026
- CWE
- CWE-611CWE-776
Could this be exploited in your environment?
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