Weak KSeF token encoding in Streamsoft Prestiż
Priority LOW 34CWE-261Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- Present
- Impact type
- —
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00291 21st percentileScored 2026-11-07
Fix Fixed Streamsoft Prestiż (Streamsoft): 20.0.380.92
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Streamsoft | Streamsoft Prestiż | 12.2.363.17 to before 20.0.380.92 | 20.0.380.92 | Patch available | CNA |
- Streamsoft Prestiż VendorStreamsoft Affected 12.2.363.17 to before 20.0.380.92 Fixed in 20.0.380.92 Patch available CNA
Remediation
- Fix · CNA Streamsoft Prestiż (Streamsoft) Fixed in 20.0.380.92
Timeline
- 2026-10-02 Threatist record created from CVE-2026-0809
- 2026-10-03 Alias added: GHSA-4h75-v39v-9pq7
References
More Streamsoft vulnerabilities
- TI-2026-76408 PingTools Network Utilities OS command injection through Watcher ICMP host CVSS 4.0HIGH 8.6
- TI-2024-06863 Weak password encoding in Streamsoft Prestiż CVSS 4.0HIGH 8.2
- TI-2024-10654 SQL Injection in Streamsoft Prestiż CVSS 4.0HIGH 8.6
- TI-2026-37330 Plaintext password storage in Streamsoft Business Intelligence CVSS 4.0HIGH 7.1
Sources
- CVE-2026-0809 · CVE Program
- CVE-2026-0809 · NVD
- FIRST EPSS
- GHSA-4h75-v39v-9pq7 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences