hi,
this is what we can read in file "/claroline/inc/claro_init_local.inc.php" :

[...]
$ssoCookieValue = md5( mktime() );

$sql = "UPDATE `".$tbl_sso."`
SET cookie = '".$ssoCookieValue."',
rec_time = NOW()
WHERE user_id = ". (int) $_uid;

$affectedRowCount = claro_sql_query_affected_rows($sql);

if ($affectedRowCount < 1)
{
$sql = "INSERT INTO `".$tbl_sso."`
SET cookie = '".$ssoCookieValue."',
rec_time = NOW(),
user_id = ". (int) $_uid;

claro_sql_query($sql);
}

$boolCookie = setcookie($ssoCookieName, $ssoCookieValue,
$ssoCookieExpireTime,
$ssoCookiePath, $ssoCookieDomain);
[...]

so, the cookie value must be always unknown.
in this code, the cookie value is the md5 value of the connection time ! really unknown ? no.

solution :
desactivate sso service
or
replace mktime() by rand(100,1000000) (for e.g)

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