CVE-2026-82416

FrankenPHP is a modern application server for PHP. Prior to 1.12.5, FrankenPHP worker mode can retain PHP session state between requests when the session extension is loaded as a shared module and is unavailable through HAVE_PHP_SESSION at compile time. In this build configuration, frankenphp_reset_session_state() is compiled out, PS(id) can survive a request boundary, and a subsequent session_start() can ignore the new request's cookie because an identifier is already present. Under concurrent requests, session_id() can therefore return another client's identifier or a stale identifier from a previous request on the same worker thread, causing cross-user session exposure, possible session hijacking, and intermittent logout behavior. Builds with the session extension statically linked, including the official static binaries and Docker images, are not affected. This issue is fixed in version 1.12.5.

CVSS v3 7.7 HIGH

7.7^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.2 / Impact : 5.5

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://github.com/php/frankenphp/commit/be24d82531675f90862b8cde1e9fc7e9ee855aa5
https://github.com/php/frankenphp/pull/2523
https://github.com/php/frankenphp/releases/tag/caddy/v1.12.5
https://github.com/php/frankenphp/security/advisories/GHSA-v3ph-cgqh-r8p5

Configurations

No configuration.

History

13 Oct 2026, 17:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-13 17:17

Updated : 2026-10-16 20:04

NVD link : CVE-2026-82416

Mitre link : CVE-2026-82416

CVE.ORG link : CVE-2026-82416

JSON object : View

Products Affected

No product.

CWE

CWE-362

Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CWE-488

Exposure of Data Element to Wrong Session

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