PHPSpreadsheet is a pure PHP library for reading and writing spreadsheet files. Its possible for an attacker to construct an XLSX file that links images from arbitrary paths. When embedding images has been enabled in HTML writer with $writer->setEmbedImages(true); those files will be included in the output as data: URLs, regardless of the files type. Also URLs can be used for embedding, resulting in a Server-Side Request Forgery vulnerability. When embedding images has been enabled, an attacker can read arbitrary files on the server and perform arbitrary HTTP GET requests. Note that any PHP protocol wrappers can be used, meaning that if for example the expect:// wrapper is enabled, also remote code execution is possible. This issue has been addressed in release versions 1.29.2, 2.1.1, and 2.3.0. All users are advised to upgrade. there are no known workarounds for this vulnerability.
The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize absolute path sequences such as “/abs/path” that can resolve to a location that is outside of that directory.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Phpspreadsheet | Phpoffice | * | 1.29.2 (excluding) |
| Phpspreadsheet | Phpoffice | 2.0.0 (including) | 2.1.1 (excluding) |
| Phpspreadsheet | Phpoffice | 2.2.0 (including) | 2.3.0 (excluding) |