CVE-2026-0809

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...

CVE-2026-0809 Weak KSeF token encoding in Streamsoft Prestiż

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...