PT-2026-24947 · Streamsoft · Streamsoft Prestiż

Kamil Dąbkowski · Published 2026-03-12 · Updated 2026-03-13 · CVE-2026-0809

Positive Technologies (AI Summary)

CVSS v4.0

6.3

Medium

Base vector

AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Name of the Vulnerable Software and Affected Versions Streamsoft Prestiż versions prior to 20.0.380.92

Description The software uses a custom token encoding algorithm that allows an attacker to guess the value of the KSeF (Krajowy System e-Faktur) token by analyzing how tokens with known values are encoded. The KSeF is a national system for electronic invoicing.

Recommendations Update Streamsoft Prestiż to version 20.0.380.92 or later.

Fix

Weakness Enumeration

CWE-261

Related Identifiers

CVE-2026-0809

Affected Products

Streamsoft Prestiż

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-0809 · Security Note
• https://cert.pl/posts/2026/03/CVE-2026-0809 · Note
• https://t.me/CVEtracker/47253 · Telegram Post
• https://streamsoft.pl/streamsoft-prestiz · Note
• https://twitter.com/CVEnew/status/2032410963807539448 · Twitter Post