CVE-2026-0809
Medium
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.
SeverityMedium
CVSS6.3
Exploit probability—
ProductStreamsoft Prestiż
PublishedMar 12, 2026
First seenMar 12, 2026
Weakness typeCWE-261CWE-261
How to fix
Update
- Streamsoft Streamsoft Prestiż20.0.380.92 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Streamsoft Streamsoft Prestiż | 12.2.363.17 ≤ v < 20.0.380.92 | 20.0.380.92 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
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