Server-side Request Forgery (SSRF) Affecting phpoffice/phpspreadsheet package, versions <1.30.6>=2.0.0, <2.1.18>=2.2.0, <2.4.7>=3.3.0, <3.10.7>=4.0.0, <5.8.1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PHP-PHPOFFICEPHPSPREADSHEET-18307195
- published25 Jul 2026
- disclosed23 Jul 2026
- creditUnknown
Introduced: 23 Jul 2026
CVE-2026-59931 (opens in a new tab)How to fix?
Upgrade phpoffice/phpspreadsheet to version 1.30.6, 2.1.18, 2.4.7, 3.10.7, 5.8.1 or higher.
Overview
phpoffice/phpspreadsheet is a Spreadsheet engine that Read, Create and Write Spreadsheet documents in PHP .
Affected versions of this package are vulnerable to Server-side Request Forgery (SSRF) in the webService process. An attacker can access internal services and exfiltrate sensitive data by uploading a crafted XLSX file containing a formula that triggers an HTTP redirect from a whitelisted domain to an internal or arbitrary target. This is only exploitable if the application uses a domain whitelist and processes user-uploaded spreadsheets with calculated values.
Workaround
This vulnerability can be mitigated by disabling HTTP redirect following in the stream context or by manually validating each redirect target against the domain whitelist.