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CVE-2026-0809

Weak KSeF token encoding in Streamsoft Prestiż

MEDIUM
6.3
CVSS Score
Published: March 12, 2026 at 01:02 PM UTC
Updated: June 17, 2026 at 10:11 AM UTC
1 product affected across 1 vendorPrestiz

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Severity
MEDIUM6.3
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Prestiz· Streamsoft
60%
12.2.363.17 ≤ v < 20.0.380.9212.2.363.17
Affected range stops below 20.0.380.92, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (2)

Product
Source: cverecord
https://www.streamsoft.pl/streamsoft-prestiz/
Third Party Advisory
Source: cverecord
https://cert.pl/posts/2026/03/CVE-2026-0809

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.3MEDIUMCERT-PL
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-261

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