Security advisory

{
  "id": "9e76d0c6a98167eb0368cae77a278cd0f8b208c36c2852dd2f9510c16a954be2",
  "url": "https://osv.dev/vulnerability/CVE-2021-27839",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-27839",
    "summary": "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.",
    "evidence": "osv:CVE-2021-27839",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-27839",
      "aliases": [
        "CVE-2021-27839"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/bigprof-software/online-invoicing-system",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "94bd508ed9e2c7d6e67f173353f24fc639d70a12"
                },
                {
                  "fixed": "f353b777fefd1d58644fdc2fe30e4ebd751356cf"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:bigprof:online_invoicing_system:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "4.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "f353b777fefd1d58644fdc2fe30e4ebd751356cf"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "4.4"
                  }
                ]
              }
            }
          ],
          "versions": [
            "4.3",
            "4.2",
            "4.1",
            "4.0",
            "3.1",
            "3.0",
            "2.9",
            "2.6",
            "2.5",
            "2.4",
            "2.3"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-27839.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:35.452241147Z",
      "provider": "osv",
      "references": [
        "https://github.com/bigprof-software/online-invoicing-system/releases/tag/4.4",
        "https://www.jinsonvarghese.com/csv-injection-in-online-invoicing-system/"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-27839",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 385680,
  "published_at": "2021-03-03T19:15:13.047+00:00"
}