CVE-2026-0809

6.3 mediumEPSS 0.3%

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.

Severity

CVSS 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

EPSS: 0.3% chance of exploitation in the next 30 days; higher than 18% of CVEs (scores of 2026-10-31)
CWE: CWE-261
Published: 2026-03-12
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

References

https://cert.pl/posts/2026/03/CVE-2026-0809
https://www.streamsoft.pl/streamsoft-prestiz/

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