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TI-2026-26406 Aliases CVE-2026-34084GHSA-q4q6-r8wh-5cgh

PhpSpreadsheet SSRF and RCE via PHP stream wrappers in IOFactory::load

Priority HIGH 81CWE-502Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-502.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00712 53rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed phpoffice/phpspreadsheet (Packagist): 5.6.0, 3.10.4, 2.4.4 +2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
PHPOfficePhpSpreadsheet4.0.0 – 5.5.0; 3.3.0 – 3.10.3; 2.2.0 – 2.4.3; 2.0.0 – 2.1.14; up to 1.30.2—No fix listedCNA
—phpoffice/phpspreadsheet (Packagist)4.0.0 to before 5.6.05.6.0Patch availableGHSA-q4q6-r8wh-5cgh
—phpoffice/phpspreadsheet (Packagist)3.3.0 to before 3.10.43.10.4Patch availableGHSA-q4q6-r8wh-5cgh
—phpoffice/phpspreadsheet (Packagist)2.2.0 to before 2.4.42.4.4Patch availableGHSA-q4q6-r8wh-5cgh
—phpoffice/phpspreadsheet (Packagist)2.0.0 to before 2.1.152.1.15Patch availableGHSA-q4q6-r8wh-5cgh
—phpoffice/phpspreadsheet (Packagist)before 1.30.31.30.3Patch availableGHSA-q4q6-r8wh-5cgh
  • PhpSpreadsheet VendorPHPOffice Affected 4.0.0 – 5.5.0; 3.3.0 – 3.10.3; 2.2.0 – 2.4.3; 2.0.0 – 2.1.14; up to 1.30.2 Fixed in — No fix listed CNA
  • phpoffice/phpspreadsheet (Packagist) Vendor— Affected 4.0.0 to before 5.6.0 Fixed in 5.6.0 Patch available GHSA-q4q6-r8wh-5cgh
  • phpoffice/phpspreadsheet (Packagist) Vendor— Affected 3.3.0 to before 3.10.4 Fixed in 3.10.4 Patch available GHSA-q4q6-r8wh-5cgh
  • phpoffice/phpspreadsheet (Packagist) Vendor— Affected 2.2.0 to before 2.4.4 Fixed in 2.4.4 Patch available GHSA-q4q6-r8wh-5cgh
  • phpoffice/phpspreadsheet (Packagist) Vendor— Affected 2.0.0 to before 2.1.15 Fixed in 2.1.15 Patch available GHSA-q4q6-r8wh-5cgh
  • phpoffice/phpspreadsheet (Packagist) Vendor— Affected before 1.30.3 Fixed in 1.30.3 Patch available GHSA-q4q6-r8wh-5cgh

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:phpoffice:phpspreadsheet:*:*:*:*:*:*:*:*before 1.30.3; 2.0.0 to before 2.1.15; 2.2.0 to before 2.4.4; 3.3.0 to before 3.10.4; 4.0.0 to before 5.6.0VulnerablePHPOffice
  • cpe:2.3:a:phpoffice:phpspreadsheet:*:*:*:*:*:*:*:* Versions before 1.30.3; 2.0.0 to before 2.1.15; 2.2.0 to before 2.4.4; 3.3.0 to before 3.10.4; 4.0.0 to before 5.6.0 Vulnerable ·PHPOffice

Remediation

  • Fix · GHSA-q4q6-r8wh-5cgh phpoffice/phpspreadsheet (Packagist) Fixed in 5.6.0 Advisory →
  • Fix · GHSA-q4q6-r8wh-5cgh phpoffice/phpspreadsheet (Packagist) Fixed in 3.10.4 Advisory →
  • Fix · GHSA-q4q6-r8wh-5cgh phpoffice/phpspreadsheet (Packagist) Fixed in 2.4.4 Advisory →
  • Fix · GHSA-q4q6-r8wh-5cgh phpoffice/phpspreadsheet (Packagist) Fixed in 2.1.15 Advisory →
  • Fix · GHSA-q4q6-r8wh-5cgh phpoffice/phpspreadsheet (Packagist) Fixed in 1.30.3 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-34084
  2. 2026-10-03 Alias added: GHSA-q4q6-r8wh-5cgh

References

Exploit 1

Advisory 1

Other 2

  • TI-2024-37339 PhpSpreadsheet vulnerable to unauthorized reflected XSS in Currency.php file CVSS 4.0HIGH 8.3
  • TI-2024-37338 PhpSpreadsheet allows unauthorized reflected XSS in `Convert-Online.php` file CVSS 4.0HIGH 8.3
  • TI-2024-37325 PhpSpreadsheet vulnerable to unauthorized reflected XSS in the Accounting.php file CVSS 4.0HIGH 8.3
  • TI-2024-37324 PhpSpreadsheet vulnerable to unauthorized reflected XSS in the constructor of the Downloader class CVSS 4.0HIGH 8.3
  • TI-2024-30160 XML External Entity Reference (XXE) in PHPSpreadsheet CVSS 3.1HIGH 8.8
  • TI-2026-29558 PhpSpreadsheet: CPU Denial of Service via Unbounded Row Number in XLSX Row Dimensions CVSS 3.1HIGH 7.5
See all 24 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences