CVE-2026-5082: Tokuhirom AMON2::PLUGIN::WEB::CSRFDEFENDER

Medium severity, CVSS 5.3. EPSS: 0.5% chance of exploitation in the next 30 days.

Amon2::Plugin::Web::CSRFDefender versions from 7.00 through 7.03 for Perl generate an insecure session id. The generate_session_id function will attempt to read bytes from the /dev/urandom device, but if that is unavailable then it generates bytes using SHA-1 hash seeded with the built-in rand() function, the PID, and the high resolution epoch time. The PID will come from a small set of numbers, and the epoch time may be guessed, if it is not leaked from the HTTP Date header. The built-in rand function is unsuitable for cryptographic usage. Amon2::Plugin::Web::CSRFDefender versions before 7.00 were part of Amon2, which was vulnerable to insecure session ids due to CVE-2025-15604. Note that the author has deprecated this module.

Affected products

• Tokuhirom AMON2::PLUGIN::WEB::CSRFDEFENDER: from 7.00, up to and including 7.03

Published 2026-04-08. Last modified 2026-07-24.