Vulnerability · Published Jun 23, 2026 · Assigned by CPANSec

CVE-2026-9733Mojolicious::Plugin::Web::Auth::OAuth2 versions through 0.17 for Perl have an insecure default state parameter

Critical 9.1

In plain English

A critical-severity security flaw in Mojolicious::Plugin::Web::Auth::OAuth2 from HAYAJO. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 44% of all known vulnerabilities).

Severity (CVSS 3.1)9.1Critical

Exploit odds (30 days)0.5%top 55.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Mojolicious::Plugin::Web::Auth::OAuth2 versions through 0.17 for Perl have an insecure default state parameter. When no state generator is specified in the constructor, the module defaults to using a SHA-1 hash of predictable and low-entropy sources, including the epoch time (which is leaked via the HTTP Date header) and a call to Perl's built-in rand function. A predictable state allows an attacker to hijack another user's session through cross site request forgery (CSRF).

Affected products (as reported)

Vendor	Product	Versions
HAYAJO	Mojolicious::Plugin::Web::Auth::OAuth2	0 – through 0.17

Weakness: CWE-340, CWE-338 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

In plain English

Official description

Affected products (as reported)

References