{"id":"CVE-2026-108357","revision":"b28856d301764341ab6143a1ee747a27","records":[{"revision":"b28856d301764341ab6143a1ee747a27","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-108357","aliases":[],"title":"PhpSpreadsheet: XmlScanner Bypass via Double-Encoded unentity() TOCTOU Allows XXE and Denial of Service","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.","state":0,"publishedAt":"2026-10-22T17:38:16.098+00:00","modifiedAt":"2026-10-22T17:38:16.098+00:00","affected":[{"ecosystem":"Vendor product","name":"PhpSpreadsheet","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"PHPOffice\",\n                    \"product\": \"PhpSpreadsheet\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 3.3.0, < 3.10.8\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 4.0.0, < 5.10.0\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"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","score":8.8,"severity":"HIGH"}],"references":["https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-rxj4-h86g-25gc","https://github.com/PHPOffice/PhpSpreadsheet/commit/89f455c133e1a7e2d4abfadc43ce29eb7450d781","https://github.com/PHPOffice/PhpSpreadsheet/commit/980b5c294493856f1a25754f1e8a1d2185b93738","https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/3.10.8","https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/5.10.0"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-108357","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-108357","identifiers":["CVE-2026-108357"]},"retained":false,"historicalAffected":[]}],"coverage":[]}