🛡️ CVE-2026-34084
🔴 CVSS 9.8 — Critical ✅ No Known Exploit CWE-502 NVD
9.8
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity CRITICAL
CVSS Score 9.8
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE CWE-502
Public Exploit ✅ No
Source NVD
Published 2026-04-29
Updated 2026-06-15
Modified 2026-05-08
Fix URL N/A

Affected Packages

Software From version Fixed in
phpoffice/phpspreadsheet — 1.30.3
phpspreadsheet 4.0.0 5.6.0
unknown — —

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