Description
Use of a custom token encoding algorithm in Streamsoft Prestiż software allows the value of the KSeF (Krajowy System e-Faktur) token to be guessed after analyzing how tokens with know values are encoded.
This issue was fixed in version 20.0.380.92.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Streamsoft | Streamsoft Prestiż | 12.2.363.17 – < 20.0.380.92 | 20.0.380.92 |
References
- https://www.streamsoft.pl/streamsoft-prestiz/ product
- https://cert.pl/posts/2026/03/CVE-2026-0809 third-party-advisory