CVE-2026-9733

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).

Score

CVSS 3.1 9.1 Critical

Status

Deferred - 9b29abf9-4ab0-4765-b253-1875cd9b441e

Published

2026-06-23

Last modified

2026-10-25

Weaknesses

CWE-338, CWE-340

Affected products

• Mojoliciouspluginwebauthoauth2 (Hayajo)

References

• https://metacpan.org/release/HAYAJO/Mojolicious-Plugin-Web-Auth-0.17/source/lib/Mojolicious/Plugin/Web/Auth/OAuth2.pm#L…
• https://datatracker.ietf.org/doc/html/rfc6749#section-10.12
• https://security.metacpan.org/patches/M/Mojolicious-Plugin-Web-Auth/0.17/CVE-2026-9733-r2.patch
• http://www.openwall.com/lists/oss-security/2026/06/23/1