/ 
Mojolicious-8.21
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/ Mojolicious::Sessions
Security Advisories (6)
CPANSA-Mojolicious-2022-03 (2022-12-10)

Mojo::DOM did not correctly parse <script> tags.

CPANSA-Mojolicious-2021-02 (2021-06-01)

Small sessions could be used as part of a brute-force attack to decode the session secret.

CVE-2021-47208 (2021-03-16)

A bug in format detection can potentially be exploited for a DoS attack.

CVE-2020-36829 (2020-11-10)

Mojo::Util secure_compare can leak the string length. By immediately returning when the two strings are not the same length, the function allows an attacker to guess the length of the secret string using timing attacks.

CVE-2024-58134 (2025-05-03)

Mojolicious versions from 0.999922 for Perl uses a hard coded string, or the application's class name, as an HMAC session cookie secret by default. These predictable default secrets can be exploited by an attacker to forge session cookies.  An attacker who knows or guesses the secret could compute valid HMAC signatures for the session cookie, allowing them to tamper with or hijack another user’s session.

CVE-2024-58135 (2025-05-03)

Mojolicious versions from 7.28 for Perl will generate weak HMAC session cookie secrets via "mojo generate app" by default When creating a default app skeleton with the "mojo generate app" tool, a weak secret is written to the application's configuration file using the insecure rand() function, and used for authenticating and protecting the integrity of the application's sessions. This may allow an attacker to brute force the application's session keys.

NAME

Mojolicious::Sessions - Session manager based on signed cookies

SYNOPSIS

use Mojolicious::Sessions;

my $sessions = Mojolicious::Sessions->new;
$sessions->cookie_name('myapp');
$sessions->default_expiration(86400);

DESCRIPTION

Mojolicious::Sessions manages sessions based on signed cookies for Mojolicious. All data gets serialized with Mojo::JSON and stored Base64 encoded on the client-side, but is protected from unwanted changes with a HMAC-SHA1 signature.

ATTRIBUTES

Mojolicious::Sessions implements the following attributes.

my $domain = $sessions->cookie_domain;
$sessions  = $sessions->cookie_domain('.example.com');

Domain for session cookies, not defined by default.

my $name  = $sessions->cookie_name;
$sessions = $sessions->cookie_name('session');

Name for session cookies, defaults to mojolicious.

my $path  = $sessions->cookie_path;
$sessions = $sessions->cookie_path('/foo');

Path for session cookies, defaults to /.

default_expiration

my $time  = $sessions->default_expiration;
$sessions = $sessions->default_expiration(3600);

Default time for sessions to expire in seconds from now, defaults to 3600. The expiration timeout gets refreshed for every request. Setting the value to 0 will allow sessions to persist until the browser window is closed, this can have security implications though. For more control you can also use the expiration and expires session values.

# Expiration date in seconds from now (persists between requests)
$c->session(expiration => 604800);

# Expiration date as absolute epoch time (only valid for one request)
$c->session(expires => time + 604800);

# Delete whole session by setting an expiration date in the past
$c->session(expires => 1);

deserialize

my $cb    = $sessions->deserialize;
$sessions = $sessions->deserialize(sub {...});

A callback used to deserialize sessions, defaults to "j" in Mojo::JSON.

$sessions->deserialize(sub {
  my $bytes = shift;
  return {};
});

samesite

my $samesite = $sessions->samesite;
$sessions    = $sessions->samesite('Strict');

Set the SameSite value on all session cookies, defaults to Lax. Note that this attribute is EXPERIMENTAL because even though most commonly used browsers support the feature, there is no specification yet besides this draft.

# Disable SameSite feature
$sessions->samesite(undef);

secure

my $bool  = $sessions->secure;
$sessions = $sessions->secure($bool);

Set the secure flag on all session cookies, so that browsers send them only over HTTPS connections.

serialize

my $cb    = $sessions->serialize;
$sessions = $sessions->serialize(sub {...});

A callback used to serialize sessions, defaults to "encode_json" in Mojo::JSON.

$sessions->serialize(sub {
  my $hash = shift;
  return '';
});

METHODS

Mojolicious::Sessions inherits all methods from Mojo::Base and implements the following new ones.

load

$sessions->load(Mojolicious::Controller->new);

Load session data from signed cookie.

store

$sessions->store(Mojolicious::Controller->new);

Store session data in signed cookie.

SEE ALSO

Mojolicious, Mojolicious::Guides, https://mojolicious.org.