CVE-2026-5082 Amon2::Plugin::Web::CSRFDefender versions from 7.00 through 7.03 for Perl generate an insecure session id
Attackers can predict session IDs due to weak entropy sources, enabling CSRF protection bypass in Perl applications using this deprecated plugin.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-5082?
CVE-2026-5082 is a medium-severity vulnerability in TOKUHIROM Amon2::Plugin::Web::CSRFDefender, published on 8 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-5082?
It affects 1 product.
Products include Tokuhirom Amon2\.
How do I fix CVE-2026-5082?
No fix has been published for CVE-2026-5082 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-5082 being exploited?
There is no known exploitation of CVE-2026-5082 in the wild and no public exploit code.
Sources
Also known as GHSA-gr8m-rq4x-q7c8.