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 wit…
Published: 2026-03-12 · CVSS: 6.3 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7