Server-Side Request Forgery (SSRF) in PhpSpreadsheet - CVE-2026-59931
Published: July 20, 2026
Vulnerability identifier: #VU138424
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-59931
CWE-ID: CWE-918
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vulnerability details
The disclosed vulnerability allows a remote attacker to perform SSRF attacks.
The vulnerability exists due to insufficient validation of user-supplied input within HTTP redirect in WEBSERVICE() domain whitelist. A remote user can send a specially crafted HTTP request and trick the application to initiate requests to arbitrary systems.
Successful exploitation of this vulnerability may allow a remote attacker gain access to sensitive data, located in the local network or send malicious requests to other servers from the vulnerable system.
Affected software
PhpSpreadsheet
How to mitigate CVE-2026-59931
Install updates from vendor's website.
PhpSpreadsheet - addressed in versions 1.30.6, 2.1.18, 2.4.7, 3.10.7, 5.8.1