SB2026101341 - Server-Side Request Forgery (SSRF) in PhpSpreadsheet
Published: October 13, 2026
Security Bulletin ID
SB2026101341
CSH Severity
High
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Server-Side Request Forgery (SSRF) (CVE-ID: CVE-2026-34084)
CWE-ID: CWE-918 - Server-Side Request Forgery (SSRF)
CVSSv4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to perform server-side request forgery and execute arbitrary code.
The vulnerability exists due to improper handling of user-controlled filenames in IOFactory::load when loading a spreadsheet using a user-controlled filename. A remote attacker can supply a specially crafted filename to perform server-side request forgery and execute arbitrary code.
Remediation
Install update from vendor's website.