CVE-2026-9733

Critical

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).

SeverityCritical

CVSS9.1

Exploit probability—

ProductMojolicious::Plugin::Web::Auth::OAuth2

PublishedJun 23, 2026

First seenJun 23, 2026

Weakness typeCWE-340CWE-340 CWE-338CWE-338

How to fix

Patches

security.metacpan.org/patches/M/Mojolicious-Plugin-Web-Auth/0.17/CVE-2026-9733-r2.patch

Affected products

Product	Affected versions	Fixed in
HAYAJO Mojolicious::Plugin::Web::Auth::OAuth2	v ≤ 0.17	—

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