Vulnerability DatabaseCVE-2026-115560
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CVE-2026-115560
Published:October 23, 2026
Updated:October 23, 2026
A flaw in PHP's session upload progress handling can lead to remote code execution when an application sets session.serialize_handler to php_binary or php_serialize in its configuration and switches it to php at runtime with ini_set() before calling session_start(), while session.upload_progress.enabled is on. The fix will ship in the next regular PHP release. Setting session.upload_progress.enabled=0 mitigates the issue.
Related Resources (2)
https://thehackernews.com/2026/10/urgent-php-warns-of-another-unpatched.html
https://www.php.net/archive/2026.php
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CVSS v4
Base Score:
9.2
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.1
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH