CVE-2026-9733

CRITICAL9.1

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

Published Jun 23, 2026

Modified 1 months ago

Details

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).

References

WEB

http://www.openwall.com/lists/oss-security/2026/06/23/1

WEB

https://datatracker.ietf.org/doc/html/rfc6749#section-10.12

WEB

https://metacpan.org/release/HAYAJO/Mojolicious-Plugin-Web-Auth-0.17/source/lib/Mojolicious/Plugin/Web/Auth/OAuth2.pm#L129-131

FIX

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

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-9733