VULNERABILITY INTELLIGENCE
CVE-2025-40923
CVSS score7.3 HIGH
EPSS probability0.39%
CISA KEVNot currently listed
Published2025-07-16
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Description
Plack-Middleware-Session before version 0.35 for Perl generates session ids insecurely. The default session id generator returns a SHA-1 hash seeded with the built-in rand function, the epoch time, and the PID. 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. Predicable session ids could allow an attacker to gain access to systems.
Weakness classification
- 9b29abf9-4ab0-4765-b253-1875cd9b441e: CWE-338