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CVE-2026-0809— Weak KSeF token encoding in Streamsoft Prestiż

Quick assessment

Affected
Streamsoft Streamsoft Prestiż
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Streamsoft Prestiz是Streamsoft公司的一个塑料行业的 ERP 系统。 Streamsoft Prestiz存在安全漏洞，该漏洞源于使用自定义令牌编码算法，可能导致在分析已知值令牌的编码方式后猜测KSeF令牌的值。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.26% · P16

Possible ATT&CK Techniques 1 AI

T1552.006 · Group Policy Preferences
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I. Basic Information for CVE-2026-0809

Vulnerability Information
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Vulnerability Title
Weak KSeF token encoding in Streamsoft Prestiż
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
口令使用弱密码学算法
Source: CVE Program / CVE List V5
Vulnerability Title
Streamsoft Prestiz 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Streamsoft Prestiz是Streamsoft公司的一个塑料行业的 ERP 系统。 Streamsoft Prestiz存在安全漏洞，该漏洞源于使用自定义令牌编码算法，可能导致在分析已知值令牌的编码方式后猜测KSeF令牌的值。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Streamsoft Streamsoft Prestiż 12.2.363.17 ~ 20.0.380.92 -

II. Public POCs for CVE-2026-0809

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III. Intelligence Information for CVE-2026-0809

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Security Blog Posts for CVE-2026-0809 (1)

IV. Related Vulnerabilities

Same product: Streamsoft Prestiż
Same vendor: Streamsoft
Same weakness: CWE-261

V. Comments for CVE-2026-0809

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