CVE-2025-8699 Business logic in Stored Value Unattended Payment Solution
Attackers can manipulate NFC card data to arbitrarily increase stored value balances, enabling unauthorized payments in KioSoft solutions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-8699?
CVE-2025-8699 is a critical vulnerability in KioSoft Stored Value Unattended Payment Solution, published on 12 Sep 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Some "Stored Value" Unattended Payment Solutions of KioSoft use vulnerable NFC cards. Attackers could potentially use this vulnerability to change the balance on the cards and generate money. The account balance is stored on an insecure MiFare Classic NFC card and can be read and written back. By carefully observing changes in card dumps, one can identify fields that store the cash value of the card. Additionally, a checksum can be identified, which is created by XOR-ing the cash and an unknown field with a certain value. By updating the fields accordingly, arbitrary amounts of money can be loaded onto the card (up to $655,35) to pay for goods.
Weakness: CWE-922
Which versions are affected by CVE-2025-8699?
How do I fix CVE-2025-8699?
No fix has been published for CVE-2025-8699 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-8699 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-8699 exists.
Sources
Also known as GHSA-rjwg-vv9p-fqpg.