Vulnerability · Published May 5, 2026 · Assigned by GitHub_M
CVE-2026-34084PhpSpreadsheet SSRF and RCE via PHP stream wrappers in IOFactory::load
Critical 9.2
In plain English
A critical-severity unsafe deserialization in PhpSpreadsheet from PHPOffice. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 54% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Packagist | phpoffice/phpspreadsheet | 5.6.0 | GHSA-q4q6-r8wh-5cgh |
| Packagist | phpoffice/phpspreadsheet | 3.10.4 | GHSA-q4q6-r8wh-5cgh |
| Packagist | phpoffice/phpspreadsheet | 2.4.4 | GHSA-q4q6-r8wh-5cgh |
| Packagist | phpoffice/phpspreadsheet | 2.1.15 | GHSA-q4q6-r8wh-5cgh |
| Packagist | phpoffice/phpspreadsheet | 1.30.3 | GHSA-q4q6-r8wh-5cgh |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| PHPOffice | PhpSpreadsheet | >= 4.0.0, <= 5.5.0>= 3.3.0, <= 3.10.3>= 2.2.0, <= 2.4.3>= 2.0.0, <= 2.1.14<= 1.30.2 |
Weakness: CWE-502, CWE-918 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N