CVE-2026-82416: high-severity vulnerability in php frankenphp
FrankenPHP: Cross-request PHP session ID leak in worker mode when the session extension is a shared module
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.7epss 0.3%
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:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L
Affected products
php · frankenphpRelated CVEs — php frankenphp
In the same product, most dangerous first.
CVE-2026-45062HIGHFrankenPHP: Unsafe Unicode Handling in CGI Path Splitting Allows Execution of Non-PHP FilesEPSS 0.7%CVE-2026-24895HIGHFrankenPHP affected by Path Confusion via Unicode casing in CGI path splitting allows execution of arbitrary filesEPSS 0.7%CVE-2026-24894HIGHFrankenPHP leaks session data between requests in worker modeEPSS 0.5%CVE-2026-85733MEDIUMFrankenPHP: Docker images serve phpinfo() as the default index.php, leaking environment variablesEPSS 0.2%CVE-2026-122233MEDIUMFrankenPHP before 1.13.4 Cross-Request Response Header Leak in Worker ModeEPSS —