{"schema":"threatline.record/2","record":{"id":"CVE-2026-108357","aliases":["GHSA-rxj4-h86g-25gc"],"summary":"PhpSpreadsheet: XmlScanner Bypass via Double-Encoded unentity() TOCTOU Allows XXE and Denial of Service","details":"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.","categories":["Unclassified"],"product":"PhpSpreadsheet","vendor":"PHPOffice","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-108357","source_modified_at":"2026-10-23T21:08:17.784Z","fetched_at":"2026-10-23T21:47:51.402276Z","product":"PhpSpreadsheet","vendor":"PHPOffice","versions":[{"version":">= 3.3.0, < 3.10.8","status":"affected"},{"version":">= 4.0.0, < 5.10.0","status":"affected"}],"defaultStatus":null}],"fixed_versions":[],"cvss":8.8,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00285,"percentile":0.19995,"score_date":"2026-10-23"},"published_at":"2026-10-22T17:38:16.098Z","modified_at":"2026-10-23T21:08:17.784Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-108357","fetched_at":"2026-10-23T21:47:51.402276Z","source_modified_at":"2026-10-23T21:08:17.784Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-108357","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-rxj4-h86g-25gc","tags":["x_refsource_CONFIRM"]},{"source":"CVE List","url":"https://github.com/PHPOffice/PhpSpreadsheet/commit/89f455c133e1a7e2d4abfadc43ce29eb7450d781","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/PHPOffice/PhpSpreadsheet/commit/980b5c294493856f1a25754f1e8a1d2185b93738","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/3.10.8","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/5.10.0","tags":["x_refsource_MISC"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"yes","technical_impact":"partial","assessed_at":"2026-10-23T17:32:57.479788Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-23T21:08:17.784Z","content_hash":"5584b5b1260248f6c9c0e1abf6db65864a3e5f579466d4adc5993516f418e524"}}