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Amon2::Plugin::Web::CSRFDefender: Weak Session IDs in Versions 7.00-7.03
CVE-2026-5082
Summary
Versions 7.00 through 7.03 of Amon2::Plugin::Web::CSRFDefender for Perl generate weak session IDs that can be guessed or predicted, potentially allowing unauthorized access to user sessions. This issue is similar to a previously known vulnerability in earlier versions of Amon2. Users are advised to upgrade to a newer version of the module, as the author has also deprecated this one.
Original title
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,...
Original description
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.
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.
Vulnerability type
CWE-338
CWE-340
Published: 8 Apr 2026 · Updated: 8 Apr 2026 · First seen: 8 Apr 2026