CVE-2026-0809
Weak KSeF token encoding in Streamsoft Prestiż
- State
- Published
- Severity
- 6.3 Medium
- Published
- Mar 12, 2026
- Updated
- Mar 12, 2026
- Reserved
- Jan 9, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.3 Medium | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N | CERT-PL |
Weaknesses
- CWE-261 Weak Encoding for Password
Affected Products
| Product | Versions |
|---|---|
Streamsoft PrestiżStreamsoft |
|
References
- https://www.streamsoft.pl/streamsoft-prestiz/product
- https://cert.pl/posts/2026/03/CVE-2026-0809third-party-advisory
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