{"cve":"CVE-2021-27839","nvd":{"published":"2021-03-03T19:15:13.047","modified":"2026-06-17T03:45:30.437","status":"Modified","description":"A CSV injection vulnerability found in Online Invoicing System (OIS) 4.3 and below can be exploited by users to perform malicious actions such as redirecting admins to unknown or harmful websites, or disclosing other clients' details that the user did not have access to.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","score":4.4},"cwes":["CWE-1236"],"references":["https://github.com/bigprof-software/online-invoicing-system/releases/tag/4.4","https://www.jinsonvarghese.com/csv-injection-in-online-invoicing-system/","https://github.com/bigprof-software/online-invoicing-system/releases/tag/4.4","https://www.jinsonvarghese.com/csv-injection-in-online-invoicing-system/"],"products":["bigprof:online_invoicing_system"],"source":"nvd","synced_at":"2026-10-19T21:15:50.279857260+00:00"},"epss":{"cve":"CVE-2021-27839","score":0.00724,"percentile":0.54063,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}