CVE WatchJul 24, 2026

CVE-2026-5082

Amon2::Plugin::Web::CSRFDefender versions from 7.00 through 7.03 for Perl generate an insecure session id. The generate_session_id function

CVSS

5.3

Medium

EPSS

0.4%

p35

KEV

—

Exploit Today

0-100

Published: Apr 8, 2026 · Last modified: Jul 24, 2026 · CWE-338 · CWE-340

EPSS · 30d

0.4%EPSS · 30 days0.4%

2026-08-252026-09-23

Technical 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.

Official references

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