Token Encoding Vulnerability in Streamsoft Prestiż Software
CVE-2026-0809

6.3MEDIUM

Key Information:

Vendor

Streamsoft

Status
Streamsoft Prestiż
Vendor
CVE Published:
12 March 2026

What is CVE-2026-0809?

The Streamsoft Prestiż software displays a security issue related to the encoding of tokens utilized by the Krajowy System e-Faktur (KSeF). A custom token encoding algorithm allows attackers to guess the value of the token after examining encoded tokens with known values. This vulnerability could lead to unauthorized access and exploitation. A patch addressing this issue has been implemented in version 20.0.380.92 of the software.

Affected Version(s)

Streamsoft Prestiż 12.2.363.17 < 20.0.380.92

References

https://www.streamsoft.pl/streamsoft-prestiz/
product
https://cert.pl/posts/2026/03/CVE-2026-0809
third-party-advisory

CVSS V4

Score:
6.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Kamil Dąbkowski
.