PhpSpreadsheet is a PHP library for reading and writing spreadsheet files. The XmlScanner class has a scan method which should prevent XXE attacks. However, in a bypass of the previously reported CVE-2024-47873, the regexes from the findCharSet method, which is used for determining the current encoding can be bypassed by using a payload in the encoding UTF-7, and adding at end of the file a comment with the value encoding=UTF-8 with , which is matched by the first regex, so that `encoding=UTF-7` with single quotes in the XML header is not matched by the second regex. An attacker can bypass the sanitizer and achieve an XML external entity attack. Versions 1.9.4, 2.1.3, 2.3.2, and 3.4.0 fix the issue.
The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Phpspreadsheet | Phpoffice | * | 1.29.4 (excluding) |
| Phpspreadsheet | Phpoffice | 2.0.0 (including) | 2.1.3 (excluding) |
| Phpspreadsheet | Phpoffice | 2.2.0 (including) | 2.3.2 (excluding) |
| Phpspreadsheet | Phpoffice | 3.3.0 (including) | 3.4.0 (excluding) |