Back to CVE records
Medium 6.3Published Mar 12, 2026
CVE-2026-0809Weak KSeF token encoding in Streamsoft Prestiż
Updated under an hour ago ()
Does this affect you?
It affects Streamsoft Prestiż. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Start free and add your stack
Free account, 1 product
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.
- CVSS
- 6.3 MEDIUM (v4.0, CNA)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
- Weakness (CWE)
- CWE-261
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- CERT-PL
- NVD analysis
- Deferred
- Record last updated
- Mar 12, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Streamsoft Streamsoft Prestiż streamsoft:prestiz (from the name) | from 12.2.363.17 before 20.0.380.92 | CNA record |
References
- https://www.streamsoft.pl/streamsoft-prestiz/product
- https://cert.pl/posts/2026/03/CVE-2026-0809third-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.