{"id":"CVE-2026-0809","state":"PUBLISHED","title":"Weak KSeF token encoding in Streamsoft Prestiż","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.\n\nThis issue was fixed in version 20.0.380.92.","publishedAt":"2026-03-12T13:02:24.795Z","updatedAt":"2026-03-12T14:04:53.073Z","severity":{"score":6.3,"label":"Medium","version":"4.0","vector":"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":"CERT-PL"},"assigner":"CERT-PL","products":["Streamsoft Streamsoft Prestiż"],"affected":[{"vendor":"Streamsoft","product":"Streamsoft Prestiż","defaultStatus":"unaffected","versions":[{"version":"12.2.363.17","status":"affected","lessThan":"20.0.380.92","versionType":"custom"}]}],"references":["https://www.streamsoft.pl/streamsoft-prestiz/","https://cert.pl/posts/2026/03/CVE-2026-0809"],"weaknesses":["CWE-261"],"ingestedAt":"2026-10-29T20:10:13.529Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/0xxx/CVE-2026-0809.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-0809","state":"PUBLISHED","datePublished":"2026-03-12T13:02:24.795Z","dateUpdated":"2026-03-12T14:04:53.073Z","assignerShortName":"CERT-PL","assignerOrgId":"4bb8329e-dd38-46c1-aafb-9bf32bcb93c6","dateReserved":"2026-01-09T14:56:38.137Z"},"containers":{"cna":{"title":"Weak KSeF token encoding in Streamsoft Prestiż","descriptions":[{"lang":"en","value":"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.\n\nThis issue was fixed in version 20.0.380.92."}],"affected":[{"vendor":"Streamsoft","product":"Streamsoft Prestiż","defaultStatus":"unaffected","versions":[{"version":"12.2.363.17","status":"affected","lessThan":"20.0.380.92","versionType":"custom"}]}],"references":[{"url":"https://www.streamsoft.pl/streamsoft-prestiz/","tags":["product"]},{"url":"https://cert.pl/posts/2026/03/CVE-2026-0809","tags":["third-party-advisory"]}],"metrics":[{"cvssV4_0":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":6.3,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"NONE","vulnerabilityResponseEffort":"NOT_DEFINED"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-261","description":"CWE-261 Weak Encoding for Password","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"CERT-PL","orgId":"4bb8329e-dd38-46c1-aafb-9bf32bcb93c6","dateUpdated":"2026-03-12T13:02:24.795Z"},"credits":[{"lang":"en","type":"finder","value":"Kamil Dąbkowski"}],"source":{"discovery":"EXTERNAL"},"x_generator":{"engine":"Vulnogram 0.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-03-12T14:04:19.633953Z","id":"CVE-2026-0809","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-03-12T14:04:53.073Z"}}]}}}