CVE-2026-108357

The PhpSpreadsheet library (versions 3.3.0 through 3.10.8 and 5.10.0) is vulnerable to an XmlScanner Bypass due to a Time-of-Check to Time-of-Use (TOCTOU) flaw in the Xml::unentity function. The root cause is that numeric entities are decoded after each DOCTYPE pattern check; a double-encoded les...

CVE-2026-108357 PhpSpreadsheet: XmlScanner Bypass via Double-Encoded unentity() TOCTOU Allows XXE and Denial of Service

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...

CVE-2026-108357 PhpSpreadsheet: XmlScanner Bypass via Double-Encoded unentity() TOCTOU Allows XXE and Denial of Service

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...

CVE-2019-10010

Cross-site scripting XSS vulnerability in the PHP League CommonMark library before 0.18.3 allows remote attackers to insert unsafe links into HTML by using double-encoded HTML entities that are not properly escaped during rendering, a different vulnerability than CVE-2018-20583...

XSS vulnerability with double-encoded entities

An XSS vulnerability CVE-2019-10010 has been identified in all previous versions of this library 0.18.2 and below. The issue has been fixed in version 0.18.3. All users should upgrade to version 0.18.3 immediately. Additionally, if your application caches the resulting HTML, please purge and/or...